The hand looks really good, save for one thing that's bugging me: the pinky.
Your knuckles (and the "webbing" between the fingers) follow a curved line, where the middle finger is the furthest forward, your pinky the furthest back, and your index and ring finger slightly lower than the middle.
Right now you have all of the fingers connected in a straight line, which looks more mechanical.
after another quick look, it looks like you have the thumb at a 90 degree angle to the hand, but this is unnatural. Most people's thumb actually rests at more of a 45 degree angle.
If you need a picture of what I'm talking about, take a look at your own hand and trace the line your knuckles make with your finger as well as looking at the "rotation" of your thumb. No reference is better than the kind that you can move and touch in reality.
besides those two minor things, I really like the finger spacing and length. It is really difficult to get into that little niche where the fingers are the right thickness and length compared to the palm, and I think you have gotten pretty close, if not hit it.
I'm going to stop myself here, as there's nothing else I would like to say.
Hope those tips help
-H
