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.

Copy the complete prompt and use your own reference photos where requested.