Turn only the bench beneath me into a mosaic

In my permitted seated portrait [SOURCE PHOTO], lock the person's facial pixels, hair, hands, clothes, posture and all objects they touch. Change only the visible [BENCH AREA] to a hand-laid [MOSAIC MOTIF] mosaic, following the bench geometry and existing wear. Maintain realistic contact shadows, seams and perspective; do not place tiles over the person or invent letters. Return one photograph and a concise edit mask. Inspect the boundary under legs and hands, repeat patterns and altered facial features. If exact facial identity matters, composite untouched source pixels rather than trusting this instruction alone.