Low-Key Back Muscle Photography

Create an ultra-realistic low-key bodybuilding photograph using the reference image. Preserve the original pose and natural body proportions. Place the subject against an almost completely black background. Illuminate only the upper back, shoulders, arms, and lats with a narrow directional light source from above and behind. Strong separation from the background, deep shadows, controlled highlights, realistic skin pores, natural muscle definition, dramatic silhouette, professional bodybuilding photography, cinematic lighting, high contrast, 85mm lens. 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.