Probably the render. Usually I just find some here though, so hardly experience that. Usually it's the text and background.
Cutting the render is reallllly tedious and annoying. If I can't find the render done anywhere, I do it myself and it takes up a lot of time. My BF always manages to find images not yet rendered so I end up having to do it coz he doesn't want to -- aimee
If I do the render myself it's most defently that (cutting the render is kidna booring to ), otherwise it's the BG for me.
Blending/brushing, getting the Background to were its exactly right. Most time consuming and hardest thing to do. Render is a lil time consuming but not hard at all, just take your time and it will look fine.
it takes me forever to decide what i ewant to make i usually try to come up with something during school then draw it when i get home