Tree reference structure: Created README specifications for Oak (seasonal), Pine (evergreen), Palm (tropical), and Dead trees. Documented size standards, visual specs, and Style 32 requirements for each type.

references/trees/oak/README.md

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+# 🌲 Oak Tree References (Deciduous)
+
+**Tree Type:** Oak - Broad-leafed deciduous tree
+**Seasonal Changes:** YES (4 seasons)
+
+---
+
+## Required References:
+
+### **Master References Needed:**
+- `oak_spring.png` - Light green leaves, fresh growth
+- `oak_summer.png` - Dark green full canopy
+- `oak_autumn.png` - Orange/red/yellow leaves
+- `oak_winter.png` - Bare branches, snow
+
+### **Size Standards:**
+- Small Oak (sapling): 96x96px
+- Medium Oak: 160x160px
+- Large Oak (ancient): 192x192px or 256x256px
+
+---
+
+## Visual Specifications:
+
+**Trunk:**
+- Color: `#8B4513` (Saddle Brown)
+- Texture: Simplified bark lines (3-5 vertical)
+- Style: Thick, chibi-proportioned
+
+**Leaves (Summer):**
+- Color: `#228B22` (Forest Green)
+- Style: Leaf clusters (NOT individual leaves)
+- Clusters: 5-10 leaves per shape
+
+**Autumn Colors:**
+- Orange: `#FF8C00`
+- Gold: `#FFD700`
+- Red: `#FF4500`
+
+**Winter:**
+- Bare branches visible
+- Snow on top: `#F0F8FF` (Alice Blue)
+- Optional icicles
+
+---
+
+## Style Requirements:
+
+✅ **MUST HAVE:**
+- SMOOTH vector-style lines (NOT pixel art)
+- THICK 5px black outlines `#000000`
+- Flat cel shading
+- Chibi cute proportions
+- Transparent background
+
+❌ **NEVER:**
+- Pixelated/chunky
+- Individual leaf sprites
+- Realistic textures
+- Thin outlines