Hey, awesome! I really do like them, and I have only one suggestion: look at your hands when you type.
Generally, when you're sitting at a keyboard, your hands will be curved forward - as if you were holding a ball in each hand. The shape changes as you move, but basically they're always curving forward into a more comfortable shape: as it is, yours look a little bit like the knuckles have been broken.
Apart from that, I'm very impressed - first we had a face, and then hands... woah. I'm wondering when we'll get a whole person modelled in Cheetah. =)
EDIT: Take a look at this, for illustration:
See how the hands aren't totally flat, but look like they could be holding something in them? That's a more natural shape, and is all I can think of to improve your model.