Over the Shoulder — Dramatic Fitness Portrait

Use the uploaded reference photo as the identity reference for the person's face, skin tone, and physique. 

Create an ultra-realistic 8K UHD photograph, 1:1 square composition, of the same person shown from behind at a three-quarter angle, one hand gripping the waistband of low-slung dark trousers. Highly defined back and shoulder musculature sculpted by a single dramatic side spotlight against a pure black background. Head turned slightly toward the camera with a calm, confident half-glance over the shoulder. Deep contrast lighting, fine natural film grain, realistic skin texture, no plastic skin, no CGI look.