I'm now practicing to use swords ! :D
I also made this to practice/improve doing my BLOOD EFFECTS !

LINK : http://www.fileize.com/view/eb1f09ba-3d5/ ;)

Not bad man! Overall really good!

I was very impressed with the blood effects you did there, much better than I'll ever do with blood. (I'm not the best at particles)

One or two things I would fix it up is: First of all, the sword could swing a little faster, or if its meant to be slow cause its a heavy sword, then thats fine. At the end of the slice, some easing isn't necessary, but it could make it look better.

It looks good when he goes back to his fighting stance, liked that. The last thing would be the body thats ripped in half. When its split in to, try to make the begging the fall slow, then speed up, then once each half hits the ground, try to sort of make it bounce slightly like if you'd drop any object on the floor.

Hope I was of some help (sorry if I wasn't) , and hope you keep animating!