diff --git a/src/components/signUp.tsx b/src/components/signUp.tsx
index 5ea8d0b..4007a09 100644
--- a/src/components/signUp.tsx
+++ b/src/components/signUp.tsx
@@ -2,7 +2,8 @@ import React, { useEffect, useState } from 'react';
 import { useNavigate } from 'react-router-dom';
 import { FirebaseError } from 'firebase/app';
 import { createUserWithEmailAndPassword, updateProfile } from 'firebase/auth';
-import { auth } from '../firebase.ts';
+import { doc, setDoc } from 'firebase/firestore';
+import { auth, db } from '../firebase.ts';
 import * as S from '../styles/auth.ts';
 import * as P from '../styles/popup.ts';
 import ImageComputer from '../assets/images/logo-small.png';
@@ -63,6 +64,12 @@ export default function SignUp({ onClose }: ISignUpProps) {
       await updateProfile(credentials.user, {
         displayName: userName,
       });
+      const userRef = doc(db, 'users', credentials.user.uid);
+      await setDoc(userRef, {
+        userName: userName || 'Anonymous',
+        userId: credentials.user.uid,
+        userAvatar: credentials.user.photoURL || null,
+      });
       navigate('/');
     } catch (error) {
       if (error instanceof FirebaseError) {
diff --git a/src/components/tweet.tsx b/src/components/tweet.tsx
index 25dfe3d..d6117d3 100644
--- a/src/components/tweet.tsx
+++ b/src/components/tweet.tsx
@@ -1,11 +1,12 @@
-import { useState } from 'react';
-import { deleteDoc, doc } from 'firebase/firestore';
+import { useEffect, useState } from 'react';
+import { deleteDoc, doc, getDoc } from 'firebase/firestore';
 import { deleteObject, ref } from 'firebase/storage';
 import { auth, db, storage } from '../firebase.ts';
 import ITweet from '../interfaces/ITweet.ts';
 import FormattedDate from '../utils/formattedDate.tsx';
 import * as S from '../styles/tweet.ts';
 import * as P from '../styles/popup.ts';
+import { ReactComponent as IconUser } from '../assets/images/i-user.svg';
 
 export default function Tweet({
   id,
@@ -16,6 +17,12 @@ export default function Tweet({
   tweet,
 }: ITweet) {
   const user = auth.currentUser;
+  const [userAvatar, setUserAvatar] = useState<string | null>(null);
+  const fetchUserAvatar = async () => {
+    const userDoc = await getDoc(doc(db, 'users', userId));
+    const userData = userDoc.data();
+    setUserAvatar(userData?.userAvatar || null);
+  };
   const [deletePopup, setDeletePopup] = useState(false);
   const toggleDeletePopup = () => {
     setDeletePopup(!deletePopup);
@@ -34,20 +41,26 @@ export default function Tweet({
       //
     }
   };
+  useEffect(() => {
+    fetchUserAvatar();
+  }, [userId, userAvatar]);
   return (
-    <S.Wrapper hasPhoto={!!photo}>
-      <S.Column>
+    <S.Wrapper>
+      <S.Avatar>
+        {userAvatar ? <S.AvatarImage src={userAvatar} /> : <IconUser />}
+      </S.Avatar>
+      <S.Row>
         <S.Username>{userName}</S.Username>
         <S.Date>{FormattedDate(createdAt)}</S.Date>
-        <S.Payload>{tweet}</S.Payload>
-        {user?.uid === userId ? (
-          <S.DeleteButton onClick={toggleDeletePopup}>삭제</S.DeleteButton>
-        ) : null}
-      </S.Column>
-      {photo ? (
-        <S.Column>
-          <S.Photo src={photo} />
-        </S.Column>
+      </S.Row>
+      <S.Payload>{tweet}</S.Payload>
+      {photo ? <S.Photo src={photo} /> : null}
+      {user?.uid === userId ? (
+        <>
+          <S.DeleteButton onClick={toggleDeletePopup} type="button">
+            <span className="a11yHidden">포스팅 삭제하기</span>
+          </S.DeleteButton>
+        </>
       ) : null}
       {deletePopup ? (
         <P.PopupWrapper>
diff --git a/src/routes/profile.tsx b/src/routes/profile.tsx
index fe441a7..c7ec994 100644
--- a/src/routes/profile.tsx
+++ b/src/routes/profile.tsx
@@ -1,7 +1,8 @@
 import React, { useState } from 'react';
 import { getDownloadURL, ref, uploadBytes } from 'firebase/storage';
 import { updateProfile } from 'firebase/auth';
-import { auth, storage } from '../firebase.ts';
+import { doc, updateDoc } from 'firebase/firestore';
+import { auth, db, storage } from '../firebase.ts';
 import WindowTop from '../components/window-top.tsx';
 import UserTimeline from '../components/user-timeline.tsx';
 import * as W from '../styles/window.ts';
@@ -11,6 +12,12 @@ import { ReactComponent as IconUser } from '../assets/images/i-user.svg';
 export default function Profile() {
   const user = auth.currentUser;
   const [avatar, setAvatar] = useState(user?.photoURL);
+  const updateUserAvatar = async (uid: string, newAvatarUrl: string) => {
+    const userDocRef = doc(db, 'users', uid);
+    await updateDoc(userDocRef, {
+      userAvatar: newAvatarUrl,
+    });
+  };
   const onAvatarChange = async (e: React.ChangeEvent<HTMLInputElement>) => {
     const { files } = e.target;
     if (!user) return;
@@ -23,6 +30,7 @@ export default function Profile() {
       await updateProfile(user, {
         photoURL: avatarUrl,
       });
+      await updateUserAvatar(user.uid, avatarUrl);
     }
   };
   return (
diff --git a/src/styles/menu.ts b/src/styles/menu.ts
index 19f4926..ffd9779 100644
--- a/src/styles/menu.ts
+++ b/src/styles/menu.ts
@@ -16,7 +16,7 @@ export const Logo = styled.div`
 
 export const LogoTitle = styled.h1`
   color: ${whiteColor};
-  font-size: 30px;
+  font-size: 34px;
   text-shadow: ${LogoTextShadow(2)};
   span {
     color: ${primaryColor};
diff --git a/src/styles/popup.ts b/src/styles/popup.ts
index a68e428..d663660 100644
--- a/src/styles/popup.ts
+++ b/src/styles/popup.ts
@@ -20,34 +20,29 @@ export const PopupWrapper = styled.div`
   background-color: rgba(0, 0, 0, 0.4);
 `;
 
-export const Popup = styled.div`
+export const PopupBox = styled.div`
   position: relative;
   display: flex;
   flex-direction: column;
   align-items: center;
   justify-content: center;
   width: calc(100vw - 100px);
+  padding: 30px;
+  background-color: ${whiteColor};
+  border: 3px solid ${blackColor};
+`;
+
+export const Popup = styled(PopupBox)`
   max-width: 757px;
   height: calc(100vh - 100px);
   max-height: 728px;
-  padding: 30px;
-  background-color: ${whiteColor};
   border-radius: 10px;
 `;
 
-export const MiniPopup = styled.div`
-  position: relative;
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  justify-content: center;
-  width: calc(100vw - 100px);
+export const MiniPopup = styled(PopupBox)`
   max-width: 400px;
   height: auto;
-  padding: 30px;
-  background-color: ${whiteColor};
   border-radius: 6px;
-  border: 3px solid ${blackColor};
 `;
 
 export const CloseButton = styled.button`
diff --git a/src/styles/post-tweet-form.ts b/src/styles/post-tweet-form.ts
index 800854a..2fa8165 100644
--- a/src/styles/post-tweet-form.ts
+++ b/src/styles/post-tweet-form.ts
@@ -8,7 +8,7 @@ export const Form = styled.form`
   flex-shrink: 0;
   gap: 10px;
   width: 100%;
-  padding-bottom: 10px;
+  padding-bottom: 20px;
   &::after {
     content: '';
     position: absolute;
diff --git a/src/styles/profile.ts b/src/styles/profile.ts
index 61dd390..56580a7 100644
--- a/src/styles/profile.ts
+++ b/src/styles/profile.ts
@@ -2,12 +2,23 @@ import { styled } from 'styled-components';
 import { grayColor } from './global.ts';
 
 export const Avatar = styled.div`
+  position: relative;
   display: flex;
   flex-direction: column;
   justify-content: center;
   align-items: center;
   gap: 20px;
-  margin: 50px 0;
+  padding: 50px 0;
+  &::after {
+    content: '';
+    position: absolute;
+    bottom: 0;
+    left: -10px;
+    right: -10px;
+    width: calc(100% + 20px);
+    height: 2px;
+    background-color: #070707;
+  }
 `;
 
 export const AvatarUpload = styled.label`
diff --git a/src/styles/timeline.ts b/src/styles/timeline.ts
index 5ecd51b..5202b05 100644
--- a/src/styles/timeline.ts
+++ b/src/styles/timeline.ts
@@ -2,6 +2,7 @@ import styled from 'styled-components';
 
 export const TimelineWrapper = styled.ul`
   display: block;
+  margin-top: 10px;
   overflow-y: auto;
 `;
 
diff --git a/src/styles/tweet.ts b/src/styles/tweet.ts
index 95459b2..98f4a64 100644
--- a/src/styles/tweet.ts
+++ b/src/styles/tweet.ts
@@ -1,26 +1,53 @@
 import { styled } from 'styled-components';
-import { grayColor, primaryColor, whiteColor } from './global.ts';
+import { grayColor, primaryColor } from './global.ts';
 
-interface IWrapperProps {
-  hasPhoto: boolean;
-}
-
-export const Wrapper = styled.li<IWrapperProps>`
-  display: grid;
-  grid-template-columns: ${({ hasPhoto }) => (hasPhoto ? '3fr 1fr' : '1fr')};
-  padding: 20px;
-  margin: 20px 0;
+export const Wrapper = styled.li`
+  position: relative;
+  display: flex;
+  flex-direction: column;
+  padding: 20px 20px 20px 60px;
   &:not(:last-child) {
     border-bottom: 1px dashed ${grayColor};
   }
 `;
 
-export const Column = styled.div``;
+export const Row = styled.div``;
 
-export const Photo = styled.img`
-  width: 100px;
-  height: 100px;
-  border-radius: 15px;
+export const Avatar = styled.div`
+  position: absolute;
+  top: 20px;
+  left: 10px;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  overflow: hidden;
+  width: 40px;
+  height: 40px;
+  border-radius: 50%;
+  &::before {
+    content: '';
+    position: absolute;
+    top: 0;
+    bottom: 0;
+    left: 0;
+    right: 0;
+    width: 36px;
+    height: 36px;
+    border: 2px dashed ${grayColor};
+    border-radius: 50%;
+  }
+  svg {
+    width: 26px;
+    height: 26px;
+    stroke: ${grayColor};
+  }
+`;
+
+export const AvatarImage = styled.img`
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+  z-index: 10;
 `;
 
 export const Username = styled.span`
@@ -39,11 +66,49 @@ export const Payload = styled.p`
   font-size: 18px;
 `;
 
+export const Photo = styled.img`
+  width: 300px;
+  height: 300px;
+  border-radius: 15px;
+`;
+
 export const DeleteButton = styled.button`
-  padding: 5px 10px;
-  background-color: ${primaryColor};
-  border: 0;
-  border-radius: 5px;
-  color: ${whiteColor};
-  font-size: 12px;
+  position: absolute;
+  top: 16px;
+  right: 20px;
+  width: 25px;
+  height: 25px;
+  background-color: transparent;
+  border: none;
+  &::before,
+  &::after {
+    content: '';
+    position: absolute;
+    top: 11px;
+    left: 6px;
+    width: 13px;
+    height: 2px;
+    background-color: ${primaryColor};
+  }
+  &::before {
+    transform: rotate(45deg);
+  }
+  &::after {
+    transform: rotate(135deg);
+  }
+`;
+
+export const EditButton = styled.button`
+  position: absolute;
+  top: 16px;
+  right: 50px;
+  width: 25px;
+  height: 25px;
+  background-color: transparent;
+  border: none;
+  svg {
+    width: 16px;
+    height: 16px;
+    stroke: ${primaryColor};
+  }
 `;