Sorry that your search has been going so poorly. Hoping things get better soon.
My DM likes Dean Spencer. Does both commissions and also sells stock art, and seems to have lots of black-and-white art. You may also want to ask Monarch Fisher, though I don't think he specializes in black-and-white. (Disclosure: M.F. is a fellow player's partner.)
EDIT: Direct link to D.S.'s black-and-white art. (Anti-disclosure: I don't know D.S. and don't benefit from promoting this art. For that reason, I also can't vouch for the artist or anything.)