Cobalt Couture Editorial Portrait

Create a high-fashion editorial studio portrait of a poised adult woman wearing a dramatic floor-length couture gown in {argument name="dress color" default="deep cobalt blue"}. She stands full body in a minimalist monochrome architectural set, with tall rectangular wall panels and door-like openings in matching dark blue tones. The model is slightly turned in three-quarter profile, standing upright with one arm relaxed at her side, her dark hair styled in a sleek low bun, and her face softly obscured or not emphasized. The gown is sleeveless with a sculptural fitted bodice, subtle V neckline, defined seam lines, pronounced peplum-like folded panels at the hips, and a long voluminous skirt that pools into a sweeping train across the floor toward the lower left. Use dramatic cinematic lighting: a focused cool spotlight from the upper left, deep shadows, glossy blue floor reflections, rich tonal gradients on the walls, and a luxurious moody atmosphere. Compose vertically in a 9:16 fashion magazine format, model centered slightly right, ample negative space above, crisp fabric texture, elegant posture, photorealistic rendering, no visible text, no logos, no extra people, no props.