Replace a background with believable integration

Replace the background of the supplied image with [NEW SETTING]. Keep [SUBJECT] unchanged: preserve identity, pose, proportions, expression, hair, clothing, accessories and all foreground details.

Match the new environment to the source camera: eye line, horizon, focal length, depth of field, perspective and crop. Adjust only the environmental colour spill and edge lighting needed to integrate the subject. Create physically believable contact shadows and reflections consistent with [LIGHT DIRECTION, TIME AND WEATHER]. Retain fine hair, semi-transparent fabric and clean edges without halos.

Do not regenerate the subject, change facial features, add text, alter logos, over-blur the background or make the result look like a studio cutout. Output at the original dimensions and resolution.