23 year old woman, completely nude, taking a mirror selfie in her bright apartment, ultra-emaciated skinny body, extremely visible ribs and spine, sharp collarbones, thigh gap, flat chest area with exaggerated contrast to massive natural sagging breasts, oversized round areolas, deep tan lines across breasts, hips and buttocks, skin stretched over bones, long unstyled brown hair, face partially visible with neutral tired expression, no makeup, natural daylight from large window, minimalist modern room, realistic skin texture with slight shine, bones casting subtle shadows, photorealistic anatomy, full body visible in mirror, casual posture, strong contrast between skeletal thinness and breast volume, realistic lighting and perspective