sorry not to lend anything else helpful, but how is this low-spec art?
and by briefly looking at your picture, I see a lot of potential alongside lots and lots of pillowshading! don't use pilloawshading. it looks bad. Pick a light source.
also some of the positions this person is in are impossible. Reality check.
I'd help more but I'm busy atm; I just think this should be in Pixel Art, not low-spec