Sepia Muscular Portrait With Obscured Face

Create a dramatic sepia-toned studio portrait of a {argument name="subject" default="handsome muscular young man"} shown from the upper torso upward, centered and facing forward. He has tousled wavy dark-brown hair with golden rim highlights, broad shoulders, defined chest and collarbones, lightly hairy chest, and wears a dark worn athletic tank top with deep armholes and a scooped neckline. The face is completely obscured by a centered opaque square block in warm medium brown, covering from the forehead area down to the mouth/chin area, leaving hair, ears, neck, shoulders, and torso visible. Use low-key cinematic lighting with a strong warm key light from upper left, subtle rim light on the hair and shoulders, deep shadows, high contrast, realistic skin texture, and a moody vintage sepia color grade. Background is a dark mottled brown studio backdrop with soft vignette and no visible props. Square 1:1 composition, tight crop at the upper arms and chest, photorealistic editorial fitness portrait, sharp detail on hair and torso, shallow depth of field, no text, no watermark.