How can I get rid of people who are already in the picture and add someone else to it?

Easy just use clone tool, most фото editing programs have it. Ты just have to select part of the background near the part of the picture Ты don't want ,in this case Eric, and clone over it. clone tool if very handy in things like this and since this a pretty simple background it should be pretty easy. in some cases the background is harder to clone but Ты can also use a different background.

What I do is just make the other character you're putting into the crossver bigger, like with this picture, so that it's less obvious... But the clone thing is a good idea too. Here's what else Ты can try. find an empty background and put both characters into the picture, like I did with my first femslash. Hope this helps a little

I’m not seriously sure.