Well I'm not much of an artist myself (I always wanted to make a thread here since I thought it was neat, but I'm always too lazy/feel crummy next to the greatness here >.<). Anyways, from my point of view, it's actually a good starting point if this is indeed a first for you.
As others have pointed, proportions seems to be your weak point, once you get that right, you can work on details and expressions and such. My suggestion is don't draw the full drawing with details right at the beginning, use a skeleton

. It can be something really simple like a stick figure with articulations, just so you can get a feel of the pose/proportions to know if they're right. Once you've done that, you move onto the "meat" and the details, then, you can either ink it and erase the lines, or scan it and erase the lines digitally

. I wish I had a link for you to work on but I can't really think of one at the moment.
Other than that, it's a very good starting point. Keep working at it, you can only get better

.
Kay