Ultra-Realistic Winter Selfie Portrait

A detailed JSON prompt for generating an ultra-realistic smartphone selfie portrait of a young woman on a frosty hilltop. The prompt meticulously defines the subject's expression (warm, candid smile), lighting (strong, low-angle winter sunlight), clothing (beanie, puffer jacket), and background elements (frost-covered ground, distant town) to achieve a high-fidelity, social media aesthetic.