Ok so this got asked on DBC and I thought I'd answer it in a blog, while I have time:
How do artists feel about having their art reposted in a forum?
Some artists won't care, some will react as though you killed their baby.
It all depends.
If you do re-post someone's art, generally the best thing to do is to credit the artist be name (and really it is only polite to give credit to the artist, yeah?),...