Already some good advice given, here's my take
Very charming sprites! While I don't know if the motion they're doing with the sword backhanded really makes sense, the hair bounce and fist pump have a lot of character.
I think your color choice could use some work, very flat and uninteresting.( and it's more of an issue in your tiles than sprites) A common trend, especially in jrpg sprites is for the shadows to tend towards one color, usually a blue/violet. Not only is this a convenient shorthand to describe some lighting scenarios, it gives the entire sprite a feeling of unity, and allows many characters to all feel like they belong in the same scene, no matter how different the local colors of their designs may be.
Also your treatment of the sword does little to describe it's material- in fact the buffering and AA you've applied makes it appear soft. Stronger contrast and a highlight ( that could come in and out of sight in animation) help sells the idea much better.
Hope this helps and good luck on your work ^_^