The base look beautiful for Cassandra...
The Hawke pictures are missing right now, so I can't give you criticism there...
The only tips that I have for Cassandra is that you change the pose of the punch itself. I hate to say it, but if you want it to look "real," you should start from scratch...Nobody punches like that. In real life, a person pulls back before unleashing a blow. Your sprite just brings the hand forward...
The spriting is well done, but the animation itself in un-realistic...
Here is an example of what I mean...
Do you see how I made him pull back 1st!?