I think the pose and line work still need a bit of practice, but otherwise, this looks awesome! (Shading especially looks pretty good.) Can't wait to see what you do with your other friends' characters!
Edit: Oh huh. I just felt like it was a tiny bit off. And as for line work, no need to change it, just keep working on finessing it. (Plus I know how that works with learning a new style and whatnot. You'll get there! :) )