Composite a subject into another photograph

Create one realistic composite using [SUBJECT SOURCE] and [BACKGROUND SOURCE]. Place [SUBJECT] at [POSITION AND SCALE] in the background.

Preserve the subject’s identity, pose, clothing and proportions, and preserve the background’s architecture and camera view. Match horizon, perspective, focal length, depth of field, white balance, grain and sharpness. Add only the contact shadow, environmental colour spill, reflections and foreground occlusion required by the scene. Retain fine hair and transparent edges without halos.

Do not change facial features, invent missing limbs, duplicate the subject, alter logos or add unrelated objects. The final image should survive close inspection at [OUTPUT SIZE]. Also provide a brief list of any unavoidable assumptions made about hidden edges or lighting.