Great work so far 
Here's what I think you can work on:
The back shoulder seems much bigger than the front one, I don't know if that's by design. If it's not, then it should curve more at the top. That same arm (the one holding the hammer) also looks a bit longer than the other one.
The front leg also appears a bit shorter than the back one, I think the heel's too high.
I hope that helps, other than that it looks great.
