One thought on the legs: I can't get over the impression that your ninja is limping. The shorter 'knee thrust' of the foreground leg/less extension of the BG leg when compared to the other half of the run cycle gives the appearance of an uneven 'gallop'.
...and props: The open-fingered blocking hand is a nice improvement. One suggestion would be to foreshorten the fingers a little bit so that the hand does not distract from the ninja's face. The trailing cloth from the ninja's mask is also absolutely *ace* in the fluttering detail; I was curious however about why, if the run speed is hyper-ninja, the cloth's flutter angles downward. I imagine it streaming out more or less horizontally behind him.
Just a thought; keep up the great work!