## 0. Subject & Format
Scene: A Christmas-themed 3×3 collage photo of two young friends.
Input:
* Left person = Image 1 (always on the left side in every panel, call this **CHAR_L**)
* Right person = Image 2 (always on the right side in every panel, call this **CHAR_R**)
Output:
* A single **3×3 square collage** (nine square panels combined into one image, not split into separate images).
---
## 1️⃣ Face Consistency (Highest Priority – Identity Lock)
* **CHAR_L**’s face must closely match the person in Image 1:
same facial structure, face shape, eye shape, nose, mouth, skin tone, and proportions.
* **CHAR_R**’s face must closely match the person in Image 2.
Hard constraints:
* No face swapping.
* Do NOT generate “similar but not the same” new faces.
* Do NOT merge the two faces into “sister/brother/template faces.”
* No over-beautification:
Across all 9 panels, both faces must always remain the **same identities**.
Only **expressions** may change; do not change the facial features or overall face shape.
---
## 2️⃣ Layout & Overall Style
* Layout: one image containing a **3×3 grid** (nine square panels).
* Each panel has a thin **white or light gold decorative border** around it.
* Style: high-detail, bright, saturated **modern Japanese Purikura (sticker booth)** style, with cute, lively colors.
* Depth of field: shallow DOF – soft, bokeh-like background; faces and bodies in clear focus.
* Overall look should be closer to **realistic photography**, not illustration or manga.
---
## 3️⃣ Christmas Background (Unified Across the 9 Panels)
* Background colors: soft pastel tones such as **light pink, light purple, mint green, light blue**, in solid or gradient fills.
* Christmas elements: lightly decorate the background with
small snowflakes, star-shaped light spots, little hearts, Christmas tree silhouettes, gift box silhouettes, etc.
* All 9 panels must share a **consistent background style and color mood**.
Small variations in hue are allowed, but the style must not switch to totally different looks.
---
## 4️⃣ Outfits & Hair – Christmas Gender-Adaptive Rules
Do **not** assume gender in advance.
Let the model infer gender from the reference photos.
Only use gender to choose the clothing template; **do not** change left/right position
(Image 1 is always left / CHAR_L, Image 2 is always right / CHAR_R).
### 👗 Female Outfit Templates
**Female Template F_A (Cute Santa style)**
* Christmas dress or top + skirt in **red or wine red** as the main color.
* White fluffy trim on neckline, cuffs, or hem, optional bows and lace decorations.
* Hairstyle: keep the **original hairstyle**, but you may add Christmas hair accessories such as:
red ribbons, bells, fluffy hair clips, Christmas wreath-style accessories, etc.
* Optional light gold or pearl jewelry.
**Female Template F_B (Japanese “lady” Christmas style)**
* Christmas color palette based on red/white/green, e.g.:
* red knit top + plaid skirt,
* green sweater + white skirt, etc.
* Fabrics: wool, knit, or other warm winter textures.
* Hairstyle: keep the **original hairstyle**, with small Christmas-themed hair accessories similarly added.
### 🧣 Male Outfit Template M (Christmas Casual / Semi-Formal)
* Top: Christmas-colored sweater (red / green / dark blue) with snowflakes or Nordic geometric patterns.
* Layered with a shirt or simple turtleneck underneath; bottom: dark long pants.
* Or: red / dark green Christmas coat or blazer, plus a subtle scarf.
* Hairstyle: keep the **original hair** from the reference.
---
## 5️⃣ Gender Combination Logic
**Case 1: Both are female**
* **CHAR_L** (left, Image 1) → wears **Female Template F_A** (cute Santa dress style).
* **CHAR_R** (right, Image 2) → wears **Female Template F_B** (Japanese “lady” Christmas outfit).
**Case 2: One male, one female**
* The model infers gender from the faces and body types.
* The **female** always uses **Female Template F_A**.
* The **male** always uses **Male Template M**.
* Left/right positions must not change: Image 1 is always left (CHAR_L), Image 2 always right (CHAR_R).
**Case 3: Both are male**
* **CHAR_L** and **CHAR_R** both wear **Male Template M**.
* They may differ slightly in sweater colors or scarf colors to create a “Christmas brothers / best friends” coordinated look.
**Hard outfit constraints:**
* Do **not** generate pajamas, loungewear, or ordinary T-shirt + jeans casual combos.
* Do **not** generate overly revealing clothing or outfits that clearly do not fit a Christmas theme.
* The outfit template for each person must remain **consistent** across all 9 panels;
only folds and angle changes caused by pose are allowed to vary.
---
## 6️⃣ Nine Poses for the 3×3 Grid (Each Panel Different)
Before
After
