Permission to board, captain?

So I decided to do something different for the skateboard deck. With any luck, I'll be able to corner the market on Spock-themed skateboards. I'm going to try and see if I can wash colour over top of this black and white painting, which could possibly speed up my painting process dramatically. Cara says if I apply a nice coat of matte medium over top, I should be able to sand it down to a nice smooth surface. Clemente says I should try using oils over top of my acrylics, which seems to be the way to go as well. How nice to be surrounded by pros!

I'll post it again once it's all gussied up nice-like. Stand by!