Add photoreal character art direction

docs/art/character_image_direction.md

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+# Character Image Direction
+
+## Goal
+
+Create high-impact base character images for a mature romance dating game. Each image should communicate the character's age, personality, body type, fashion sense, sensual appeal, and romantic tone at a glance.
+
+## Baseline Prompt Rules
+
+- Solo adult woman, clearly 19 or older.
+- Full-body standing key art, vertical composition.
+- Main direction: premium photorealistic character key art with cinematic lighting.
+- Secondary direction only when useful: semi-realistic dating-sim illustration.
+- Mature, attractive, unmistakably sensual fashion and body language.
+- No nudity, explicit sex act, fetish framing, school uniform, childlike styling, or ambiguous age.
+- No text, logo, watermark, extra characters, or busy background.
+- Use generous margins so the character can be used as a standing portrait asset.
+
+## Quality Checklist
+
+An image passes only when all of these are true:
+
+- The character clearly reads as an adult.
+- Outfit, pose, expression, and silhouette match the character brief.
+- Even shy or pure-hearted characters still carry visible adult sensual charm through styling, posture, and lighting.
+- Body type is distinct from the rest of the cast.
+- Face is appealing, stable, and not uncanny.
+- Hands, legs, and feet have no obvious anatomy errors.
+- The asset works as a base standing image in a character screen.
+- Resolution is high enough for production review, or the asset is marked as a draft for upscaling/regeneration.
+
+## Cast Variety Targets
+
+- Avoid making every character the same face, height, pose, and body shape.
+- Rotate visual tone: warm, shy, sharp, glamorous, mature, athletic, artistic, elegant, casual.
+- Use fashion to signal route identity before the player reads text.
+- Keep sensuality character-specific: shy routes should feel quietly irresistible, career routes sharply confident, public-image routes glamorous, and mature routes restrained but intense.
+
+## Current Asset Notes
+
+- `assets/characters/han_seoyun_v1.png`: strong warm cooking-instructor read, tasteful sensuality, good full-body composition. This photorealistic direction is now the preferred style target.
+- `assets/characters/style_tests/han_seoyun_semi_realistic_test.png`: useful semi-realistic illustration candidate, but no longer the main direction.
+- `assets/characters/style_tests/yu_harin_semi_realistic_test.png`: strong semi-realistic candidate, but should be regenerated in the photorealistic direction.