Nice job

You are pretty good to draw (even more than me (believe me, i suck a lot XD))
But you can improve your skills and be a great artist my friend.

pretty good

there's a couple things you'd need to work on though:
the hands seem too small compared to the head, either that, or vice versa.
the mouth seems kinda close to the chin
hair looks a bit big for that style
and the neck seems a bit long.
I use stick figures to help with proportions, then draw around it. helps me out alot.

I've seen better

not to good