High-Fashion Studio Portrait with Strict Identity Lock

An extremely detailed, technical prompt for generating a luxury high-fashion studio portrait. It mandates a strict face identity lock based on an uploaded reference image, ensuring no changes to facial structure or skin texture. The scene specifies precise camera settings (85mm prime, f/4), clean studio lighting (large softbox key light), and styling (black deep V-neck dress, bold gold chain necklace) against a pure white background.