Great Drawing!! I really like all your work, but may I please make some constructive critisism? Try to draw the heads in different positions, they look great, but they all have a slightly left side angle to their heads.
I draw that way too XD but for somebody much better than me, I think you should draw them differently.
Please don't take this a bad way! I'm not offending you!! I'm just giving you contructive critisism!! I hope it helps!