Split Background Studio Portrait Prompt

Create a high-end studio portrait of a smiling {argument name="subject description" default="young adult man with short dark brown hair, blue eyes, light skin, and neatly trimmed stubble"} facing straight toward the camera, centered and cropped from the upper chest upward. He wears a fitted {argument name="shirt color and style" default="premium crimson red crew-neck t-shirt"}. Split the entire image into exactly 2 vertical halves with a razor-sharp thin white divider line running perfectly from the top edge to the bottom edge through the center of his face and torso: the left half has a solid {argument name="left background color" default="deep crimson red"} studio backdrop, and the right half has a solid {argument name="right background color" default="clean white"} studio backdrop. Keep the subject symmetrical and aligned with the divider, with one half of his face on each side, a natural friendly smile, crisp facial detail, realistic skin texture, polished commercial lighting, soft shadows, sharp focus, and premium editorial retouching. Use a vertical 3:4 composition, minimal background, no text, no logos, no props, no border other than the central divider.