I love it Kurt! Only small little opinion is that the head seems to wobble a bit much. It should rotate side to side with the punches but not so much as wobbling from shoulder to shoulder. I hope it makes sense. It seems like he's nodding happly with the rythm of some background music, if you know what I mean.

For the kicks, just keep in mind that the kick originates always from the hip, and that it's composed of 4 parts:
1) Shift the weight on the supporting leg
2) Chamber the kick in, by flexing the knee
3) The leg extends, in a push motion for a front or side kick, in a sweeping motion for a round kick. The supporting foot twists to add momentum to the kick.
4) After making contact, the leg goes back to flexed knee

I don't know much of 3D animation, but I have been kickboxing for 5 years now...