That's pretty good for a first rigged character but a few things could be improved.

A lot of this really depends on what you're going for but, usually when someone jumps they lower their hands as they bend their legs, and if he was looking to jump up, his head would look up first while he's crouching. Besides that, just the timing and parts where the limbs accelerate and decelerate could be tweaked...

But overall nice work.