diff --git a/app/src/main/res/layout/activity_chat_room.xml b/app/src/main/res/layout/activity_chat_room.xml
index bfd9a722..6a89f5a5 100644
--- a/app/src/main/res/layout/activity_chat_room.xml
+++ b/app/src/main/res/layout/activity_chat_room.xml
@@ -13,10 +13,11 @@
         android:layout_height="0dp"
         android:contentDescription="@string/a11y_profile_background"
         android:scaleType="centerCrop"
-        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintDimensionRatio="H,2:3"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent" />
 
     <!-- 딤 처리 (activity_character_detail.xml의 view_character_dim 스타일 참조) -->
     <View
@@ -24,10 +25,10 @@
         android:layout_width="0dp"
         android:layout_height="0dp"
         android:background="@color/color_99000000"
-        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintBottom_toBottomOf="@id/iv_background_profile"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintTop_toTopOf="@id/iv_background_profile" />
 
     <!-- 헤더 영역 -->
     <androidx.constraintlayout.widget.ConstraintLayout
diff --git a/app/src/main/res/layout/item_character_gallery.xml b/app/src/main/res/layout/item_character_gallery.xml
index 00eed467..3da825a7 100644
--- a/app/src/main/res/layout/item_character_gallery.xml
+++ b/app/src/main/res/layout/item_character_gallery.xml
@@ -5,14 +5,14 @@
     android:layout_width="match_parent"
     android:layout_height="wrap_content">
 
-    <!-- 이미지 컨테이너: 4:5 비율(800:1000) -->
+    <!-- 이미지 컨테이너: 2:3 비율(가로:세로) -->
     <ImageView
         android:id="@+id/iv_image"
         android:layout_width="0dp"
         android:layout_height="0dp"
         android:contentDescription="@null"
         android:scaleType="centerCrop"
-        app:layout_constraintDimensionRatio="4:5"
+        app:layout_constraintDimensionRatio="2:3"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
diff --git a/app/src/main/res/layout/item_chat_background_image.xml b/app/src/main/res/layout/item_chat_background_image.xml
index a3958c96..619d967c 100644
--- a/app/src/main/res/layout/item_chat_background_image.xml
+++ b/app/src/main/res/layout/item_chat_background_image.xml
@@ -10,7 +10,7 @@
         android:layout_height="0dp"
         android:contentDescription="@null"
         android:scaleType="centerCrop"
-        app:layout_constraintDimensionRatio="4:5"
+        app:layout_constraintDimensionRatio="2:3"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />