Ultra-realistic full-body mirror selfie of a young woman (same face as reference image, 100% accuracy). Hair in casual messy updo with strands framing face, gentle confident smile, holding silver smartphone in right hand. Outfit: beige/light brown athletic sports bra, black athletic shorts, revealing toned midriff and belly button. Background: rows of light wooden lockers with ventilation slats extending into distance, spacious locker room setting. Ceiling: bright rectangular fluorescent lights, cool-toned even illumination. Atmosphere: natural, bright, casual, straight-on eye-level perspective.