Poster Project Update

So, I think I've got a pretty solid idea of what I want to do.  I was playing with this design, and this is sort of the basic color scheme I'm going with.

 Except I plan for the finished product to have a black background, try to make those colors glow (does anyone have good advice on how to accomplish that, by the way?)

This is the more cleaned-up design that I've chosen.  I'm going to trace this sketch more neatly in Photoshop and work from there.
Comments?  Advice?