{   "render_goal": "Elegant metamorphosis fashion portrait",   "subject": {     "pose": "female standing gracefully with one leg forward",     "expression": "serene confident smile"   },   "wardrobe": "minimal couture gown in pale lavender with silk elements transforming into butterfly-wing textures",   "environment": {     "location": "neutral editorial backdrop",     "props": "soft silk wing fragments floating naturally, no glow"   } }