Image editing, quality improvement, AI, ML, DL,

Hi there, we have software with a trained model which do face swap on images. It works perfectly mostly, but we need a few additional improvement. On the result images we can see a slight rectangle which we would like you to make disappear, and also the reface doesn't work on the bottom of the image, on the chin part. So we would like to extend the refacing on the chin part too. You should edit the current software. It was written in python.
We need someone who can fix these. Please check the images I give you as an example and you will understand.