add new skill baoyu-comic

skills/baoyu-comic/references/styles/sepia.md

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+# sepia
+
+Historical, archival feel
+
+## Style Guidelines
+
+### Line Work
+- 2px, classic weight with aged texture
+- Vintage illustration style
+- Period-appropriate techniques
+
+### Character Design
+- Period-accurate attire, formal poses
+- Historical accuracy emphasized
+- Classical proportions
+
+### Background Treatment
+- Historical settings, vintage details
+- Aged paper effect
+- Period architecture and props
+
+## Color Palette
+
+- Primary: Sepia brown (#8B7355), aged paper (#F5E6D3)
+- Accents: Faded teal, muted burgundy
+- Background: Yellowed paper, vintage tones
+
+## Mood
+
+Historical distance, period authenticity
+
+## Best For
+
+Pre-1950s stories, classical science, historical figures