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.
I think she is redeemable, Darth Vader did far worse as a Dark Sider and he was redeemed. She will never be the padawan she once was, but she won't completely give into the dark side either. I see her and Ahsoka meeting again
Maybe, assuming they haven't killed her already & Season 6 can be revitalized?
If it does happen, they could show that she's realizing what she has done in spite of whatever her goal was (what was she trying to accomplish again? ) & realizing her mistake & is now determined to stay true to her goal but also repent & redeem herself, not just in everyone's eyes?