Flatten skill category directory structure

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+# Character Sheet Workflow
+
+## Overview
+
+Character Sheets are a key tool for maintaining character consistency in MV production. By generating standardized character reference images, you ensure uniform character appearance across all subsequent scenes.
+
+## Character Sheet Types
+
+### 1. Turnaround Sheet
+
+Shows the character from multiple angles: front, 3/4 view, side, and back.
+
+```
+Prompt template:
+"Character turnaround sheet of [character description], showing front view, 3/4 view, side view, and back view. [clothing description]. Clean white background, consistent lighting, full body, character design reference sheet, anime/realistic style."
+```
+
+### 2. Expression Sheet
+
+Shows the character in different emotional states.
+
+```
+Prompt template:
+"Expression sheet of [character description], showing 6 different emotions: neutral, happy, sad, angry, surprised, contemplative. Same angle (front-facing), consistent lighting, bust shot, clean layout, character reference sheet."
+```
+
+### 3. Pose Sheet
+
+Shows the character in different action poses.
+
+```
+Prompt template:
+"Pose reference sheet of [character description] in [clothing description], showing 4 dynamic poses: standing, walking, sitting, [specific action]. Full body, clean white background, consistent proportions, action reference sheet."
+```
+
+## Workflow
+
+### Step 1: Define Character Description
+
+Write a detailed character text description including:
+- **Body type**: Height, build (slim, athletic, curvy...)
+- **Facial features**: Face shape, eye color, hairstyle and hair color
+- **Clothing**: Detailed outfit description
+- **Aura**: Overall impression/vibe
+
+Example:
+```
+A young Chinese woman in her mid-20s with delicate features. She has long straight
+black hair reaching her waist, almond-shaped dark brown eyes, and fair skin.
+She wears a modern hanfu-inspired outfit: a white silk top with subtle floral
+embroidery and a flowing navy blue pleated skirt. Elegant and ethereal presence.
+```
+
+### Step 2: Select Generation Model
+
+| Style Requirement | Recommended Model | Reason |
+|-------------------|-------------------|--------|
+| Realistic characters | Kling (face mode) | Strongest facial consistency |
+| Anime characters | Midjourney (--niji 7) | Highest anime quality |
+| Concept design | Gemini / OpenAI | Fast iteration |
+| Stylized | Kontext | Can convert from photos to style |
+
+### Step 3: Generate Character Sheets
+
+1. **Generate the front-facing base image first**:
+   ```
+   "Portrait of [character description], front-facing, neutral expression, soft studio lighting,
+   clean background, character reference, high detail"
+   ```
+
+2. **Using the base image as reference, generate turnaround sheet**:
+   ```
+   image_paths: [base image]
+   prompt: "Character turnaround sheet based on this character..."
+   ```
+
+3. **Generate expression sheet**:
+   ```
+   image_paths: [base image]
+   prompt: "Expression sheet of this same character..."
+   ```
+
+### Step 4: Verify Consistency
+
+After generation, check:
+- [ ] Are facial features consistent across all angles?
+- [ ] Is the hairstyle logical from all angles?
+- [ ] Are clothing details maintained consistently?
+- [ ] Are body proportions stable?
+- [ ] Is the overall style unified?
+
+Fix inconsistencies using Kontext or Kling.
+
+### Step 5: Output for Downstream Use
+
+Character sheet applications:
+- **Video first frame generation**: Use Kling face mode + scene description
+- **Storyboard generation**: Use as character reference images
+- **Lip sync**: Provide front-facing close-up as first frame
+
+## Photorealistic Character Design
+
+When "real-person photo" quality is needed for character design:
+
+```
+Prompt template:
+"Professional photography headshot of [character description], [expression],
+shot on Canon EOS R5, 85mm f/1.4 lens, natural window light,
+clean neutral background, magazine quality portrait, photorealistic,
+8K detail, skin texture visible, catchlight in eyes."
+```
+
+Key elements:
+- Specify camera and lens parameters to increase realism
+- Describe light direction and quality
+- Mention skin texture and catchlight
+- Use photography terminology rather than painting terminology
+
+## MV Character Design Best Practices
+
+1. **Prepare for lip sync**: Front-facing character close-ups should have mouth slightly open or in a speech-ready state
+2. **Multiple outfits**: If the MV has scene changes, prepare corresponding outfit versions for each scene
+3. **Emotional range**: MVs require rich expressions — ensure the expression sheet covers all emotions in the song
+4. **First-frame friendly**: Character image composition should work as a video first frame (leave room for motion)
+5. **Save all prompts**: Record the prompt used for each generated image for easy reuse and adjustment