After first spin, at around frame 790, the other spin in opposite direction was unnecessary. If you used the momentum from previous spin and with a proper leg placement, you got a good increase in momentum.
You may be familiar with spinning technique for getting momentum. First rotate all the way to one direction, say right and then rotate in other direction, left. Then, to get even more momentum, repeat this process and also work on getting closer to uke during all the process. You will get one hell of a momentum packed for a destructive kick.
Back on replay, the second kick around 550 could be edited. Instead of split, If you contracted the kicking leg's knee and targeted the hip with a relaxed foot, you would gave uke one hell of an ass blast.
For the ending and posing part, moving as less as possible with best looking pose is the only tip I can give.
In a replay, try to present yourself in as less time as you can.
Overall I'd give it a 8/10. You have done pretty good job on your style so, this one is for style 9/10. 1 less because of the sudden pause at frame 790. (: