Swing!

I'm trying to perfect my portfolio and, after concluding that I don't have enough black and white illo's, decided to work on this. It comes from an old sketch I did a year or two ago that I always liked. I like the energy. I'm mostly pleased with the way it turned out, but there are some things that I'm not as happy about. Does it work for you? I really enjoy working with b/w, probably because my colors are limited and I have to work within just that framework, making things work out in a way that too many options doesn't.