How to get a clear image around chairs and person

What do you folks recommend we do to clear up the image?

I am helping a friend clear up his greenscreen image on his live broadcast. He has a paid Manycam subscription. He is getting pixelation around the chair he sets in and himself. We have hung a cloth green screen to cut the reflection of the green out. He originally painted the wall green screen green and it reflected to much green onto objects around the wall. We are updating the lighting of the greenscreen and himself. We are looking at getting a newer camera as well. The space between him and the green screen is a bit short and have to live with the short distance.

If you want to see the image live you can go to his website and watch.
His web site is https://edwardsauctions.com/
He has auctions Monday thru Friday starting at 5PM.
Thanks for any help anyone can provide.
Ron