What should I do about a noticeable profile picture boundary?

The project is really great, but I was hoping to get full-body images. In both the 'full' and 'extfull' modes, there is a clear demarcation between the head and the body, making it obvious that the head is trained separately and then pasted back onto the original image. Is there any solution to this problem? Thank you very much.

明显的头像分界怎么办