Change the tops of only the main subject(s) from the user-uploaded image to a black, crisp cotton-poplin business long-sleeved shirt featuring a pointed collar. The main subject(s) refers to the primary person or group of people in the foreground as the visual focus of the image. Ensure the shirt fully covers the torso and upper arms, leaving no trace of the original top.
Do NOT change, remove, or alter any clothing of background people — they must remain exactly as in the original image.
All people remain in the exact original position with no body movement, identical posture, same face, same lighting. Background characters must stay completely unchanged in clothing, appearance, and position.
Enhance image quality. Make the picture clearer and more textured while preserving realism and natural integration.