Cinematic Blue-Lit Gym Portrait.

"A realistic, high-contrast gym portrait of a very muscular, shirtless young man standing in a dimly lit training space, head tilted slightly down with a calm, intense, slightly brooding gaze off to the side. He has short, dark, tousled hair with volume on top, a short, neatly groomed black beard and mustache, and a small stud earring. He has a highly developed bodybuilder physique with broad shoulders, full rounded deltoids, thick pecs, defined six-pack abs, and veiny forearms. He wears a thin silver chain necklace, a silver metal-link bracelet on one wrist, a black cord or band on the other wrist, and a small fine-line cross tattoo with script lettering on his inner forearm, with loose black high-waisted trousers with a metal button. His arms hang relaxed at his sides. The background is a softly blurred gym interior with a vertical cool-blue light strip on the left edge, dark marble-like wall panels, and metal racks and shelves on the right. Moody low-key lighting with soft directional highlights sculpting the muscles, deep shadows, shallow depth of field, natural skin texture with visible veins, fitness editorial photography, shot on a smartphone, 85mm look, 3:4 portrait aspect ratio, dark teal-black and warm skin-tone color grade." Insert discreet watermark in the lower right corner of the image, vertical text (rotated 90°), written "aipromptlabs.online", Calibri Light font, white color with low opacity (semi-transparent), medium size. Extreme sharpness on the face, fabric texture and typography of the letters. Shot on Canon EOS R5, 50mm f/2.8, studio light.