One thing you can do is hang a bolt of fabric on your wall and make sure it is taller, and longer and wider than your actual shot. If you get a piece of fabric (or a blanket that doesn’t have a noticeable sheen or texture) that is either dark gray or grayish blue, with no wrinkles in it, it will look just like you took it in a professional studio as long as all of your lighting is correct. Make sure your subjects’ head is very close to the fabric so that you don’t get a shadow on the fabric. The best way to do this and get good lighting is to do it outside on a bright, but overcast day. You could hang the fabric from a fence or a clothesline or from the eves on your house.