Great work! You have some serious skills here, and even more potential! Your anatomy is close to perfect- my only pet peeve is that the outlines could be a little bit more clean, which could be something you work on in future drawings.
But I have to say, I kinda like the sketchy style! It works really well with the pieces, as a matter of fact.
Keep it, up, I'm looking forwards to seeing more from you! :)
~StarryLatiasGirl