Let's see, you asked bit of feedback right? Bit late, but here goes;
Well, let's see, the one sitting on an edge is a good idea, but remember, his lower leg can't move like that if his upper leg is in that position. And it looks a bit too long.
The hitting on the hat can do without the circle (really, it looks amateuristic on such a little template)
The drawing weapon one, well, try to see where the weapon is before you draw it, try doing it with a sprited weapon. A simple stick to prevent problems.
His chest till his feet is a straight line, change that, add more shape to the body. I know 1 pixel will make the whole sprite look different, because of it's size but at least change the rear leg.
The sideview battle stance, well, what the hell is he doing with his arm? Also, try to make it look more as a looping motion, instead of making it so schocky. Meaning let it move less.
Last one makes it a little hard to imagine for me what's it exactly doing, at first I thought it was doing excersices. Pay attention to what positions you bring his parts of his body in, and think if that is possible for a human being or not, try it yourself for example.
Well, I hoped that helped a bit.