Transform only the two masked hand regions into solid cool-gray granite, from fingertips to each wrist crease. Stop the granite exactly at each wrist crease. Both forearms on the elbow side of the wrists retain the original human skin and its color. Preserve the original hand shapes, finger positions, face, hair, body, blue cardigan and shirt, pose, table, library, camera, crop and lighting. Keep every unmasked region unchanged.