It would nice to see the lowered arm move more into a shielded position and possibly see her step back, but other than that this is really nice. I've find your animation exercises very inspiring and enjoyable.
Each clip take usually take from 1-2 weeks. I started animating clips from January 2012 but I started whole project from November 2011 which I made a an animated storyboard and half the backgrounds. I do procrastinate a lot though. .
can I ask how long these are taking you? Just kinda curious since I animate to.
But it'd obviously have to take ALOT of work to be this good.