Great piece!

Arms are a bit over-pumped, but thats not very critical :P

 This is pretty sick!

Cool! I think his arms look a little balloony, though. Maybe some rippling muscles instead? I really dig the design, though.

Ok, got it! I'll get to work on that, and update when I'm finished. For now, I'll just use a static image.

the thing about making a successful animation is that it must look fluid. just moving around the separate parts isn't going to work, you'll have to redraw lots of stuff or it'll just look like disassociated parts floating around. when one muscle moves, it affects the muscles around it, and all sorts of things are pulled or scrunched.