Yes, most of the time its the render, but more specifically, usually the head/face. I always try ( just me personally) to not put effects over the part of the face I want people to look at. When it comes to backgrounds, I generally try simple but mainly cuz I'm afraid of overpowering my focus ( excuse the self analysis lol) if ur going to have a complex background, blurring parts of it brings out your focus as well as improving depth, just don't overdo it (takes practice ^_^) Pm me if u have any questions, but your opinion is what rly matters. Make sure YOU like what you've made Good luck and have fun