Task: Generate "Chinese Four Major Festivals Nail Art 2x2 Grid" Collage
Core Instructions:
Based on a clear close-up hand photo provided by the user (or same-style reference), generate a 2x2 grid collage. All four frames must feature the same hands, same composition, same lighting, same background style, only replacing the nail art design theme.
Each frame bottom must label the festival name: Spring Festival / Qingming / Dragon Boat / Mid-Autumn (Chinese preferred; English as backup if text is error-prone).
Global Unified Style (all four frames must follow):
Composition: Female hand close-up, fingers resting on soft knit sweater cuffs or light-colored fabric, shallow depth of field, HD photography, 4k.
