This is more complicated than I thought.
At first I did the entire animation slashing from the wrong direction, and started over. Now I'm fixing up frame 1.
EDIT:
There it is. It's a bit rough, and I'd appreciate if some people who are better than I at spriting could fix it up. Also, I totally couldn't get the left arm, so I left it as a little nub. You should probably fix that too.