674063
I do, and give full credit to the artists. I've gotten lots of art from Alkarasu, some form Swyrl, and even a beutiful picture out of the blue from Skrapbox

most artists will let you use pictures, if you credit them for it.

673148

I don't think anyone asks the artist for permission when using his/her work, TBH xD.

673091
Grabbed it off of this Deviantart post: http://jdan-s.deviantart.com/art/Not-Safe-For-Woona-351325326 . No I'm not the artist and I didn't ask for permission either. I'm a bad person!

I'm a little curious: who made the avatar image that you're using? (Okay, I lied. I'm very curious.)