I really like where you're going with this character. The design is cool and I like the colors you're going with. There's only two things that I noticed that I think you should check. The first one is the perspective of the body. For the most part I think it's actually fine, except for her shoulder and chest area. THey seem to follow a different perspective than the rest.
I think it should look more something like this
The second thing are her legs. They look really big and long for her body. That may be a stylistic choice that you're going for, but if not, then I think something like this might look more realistic in terms of proportions .
And one last thing I just noticed, but it's more of a design preference, but I think she could use a slighlty longer skirt. It'd be unfortunate that everytime she fights she exposes herself 
Hopefully I wasn't too nitpicky and that it helps you. I really enjoy where you are going with this character and I'm looking forward to see the finished concept!
