I like it, but I really think you should clean up your lines and finish your figures before posting them. It would be a whole lot more useful to you that way. =) (when the pic is cleaner, we can comment on particulars...when the pic is sketchy, we can probably only comment on anatomy)
So, regarding anatomy:
Eyes should be halfway up the head. On your pic, they're closer to the top of the head than the bottom.
His head looks too small to me.
Actually, those are all the crits I can think of. =p
Try a complete coloring and shading, I am curious to see what you can do ^_^ (I quite like your works)