Regarding of use of my art: I generally okay with that, if it is done for non-commercial things.
however, most of my work is either stuff relating to my Leaving the Cradle webcomic, or stuff that I made for other people, commercially. You can't use that for anything more than personal use (like illustrate something in RPG session with your friends), and even then I'll frown at you intensely for that. Especially if you won't credit the source.
Usually it's outlined in the descriptions by the presence of
> > > > I DO COMMISSIONS < < < <
> > Check out the prices here < <