Yeah, the easiest way is suimply to skip the Studio ovbject(s). You can create a neutral background or use a nature view. In my game I have a photo studio set up in the basement of a community lot.I just teleport sims in there, to avoid NPCs disturbing. No doorway. There are ready painted walls etc for portraits, and also a few CC versions of the Photo Studio object. (check download section on my blog if you want more backdrops for your studio object).
You can move in a photographer temporarily. You won't need high skills to get a decent photo, only the value would increase but the visuals won't change.