Wow! Absolutely fantastic! It's imaginative and unusual! I like this one more than the coloured one (there's nothing wrong with that one, the colouring is very good) because this looks more menacing and sinister.
There are a few places that make artist submitted shirts, though I've never done it myself, but I've seen other artists on DA who submitted work and sold through them. Uhhh, maybe check out Threadless or Redbubble? xP