Deeee thanks a lot! I heard about the "skeletal" animation before, I though it was complicated, but doing some research it is not that hard, what I'm doing right now is to draw the sprites and use the bezier tool to work in inkscape, and finally add some details.
For the hair and the cape animation, I think it can be possible to achieve, but it will require more effort, I'll play with the nodes in inkscape.
Thanks to all I'll post the sprites as .gif for all of you to look the result.
(by the way, I found this tutorial http://goo.gl/eGwrn)