I'm a bit confused. Why do a lot of you give credit if they use an icon made by someone else but not if they use an icon made from art by someone else?
I personally don't like using images that aren't from, say, official art or a screencap or something. I usually won't even use icons made by other people if they say they're made from someone else's fanart.
I just assume that other people will assume this is from an official trading card and that credit isn't really necessary. :V