Well it looks rough IMO, but I think it's on the right track so I'm going to upload it anyway. I wasn't able to get any crits/comments in the forum so I'd be happy to hear any here!

This was my first idea for the triptych challenge, but moving back into school left me without the time to finish it. 

 Here's my ref and this was my initial sketch.

The next thing I make is definitely going to be less derivative, but I just thought that picture translated so well into a triptych that I didn't feel any need to change it (aside from dividing it, naturally).

It has 18 colors including transparency, but a few of them are just stray pixels that I haven't found yet.