I really love the detail you gave to her facial features. I think it would have been better if you added tears in her eyes.
Also I really love the way you colored her lightsabers and the way they were positioned. In a way it represents her emotional conflict. And from the look of sadness, frustration and despair it's almost as if she's saying "Please Don't hate me".
I really have to commend the writers of TCW for making Barriss into a tragic tormented villain.