Add photoreal character art direction

assets/characters/README.md

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+# Character Assets
+
+## Main Style
+
+The preferred character image direction is premium photorealistic key art.
+
+Base standing images should feel like high-end promotional portraits for a mature romance game: cinematic lighting, realistic fabric, distinct body silhouettes, expressive adult faces, and character-specific styling.
+
+## Current Files
+
+- `han_seoyun_v1.png`: preferred photorealistic style target.
+- `style_tests/han_seoyun_semi_realistic_test.png`: semi-realistic comparison candidate.
+- `style_tests/yu_harin_semi_realistic_test.png`: semi-realistic comparison candidate.
+
+## Asset Naming
+
+- Use `<character_id>_v<number>.png` for main candidates.
+- Use `style_tests/<character_id>_<style>_test.png` for experiments.
+- Keep generated originals in their default generator folder; copy selected candidates into this project.