As a small note, it took me a few moments to realize that her second sleeve was part of her raised arm and not a ponytail, because the arm itself seems to fade into the background. My other feedback, in case this is your character and not art of someone else's character, is that the cut-out hips on her pants actually make them nearly impossible to wear XD They'd be sagging down and riding up every time she took a step! Plus, the belt would chafe against her hips quite painfully. I know that practicality might not have been the main thing on your mind when it was designed, but it actually distracted me from the art.

 

Other than that, I think it's a wonderful piece. Her pose is dynamic, the subtle background adds depth... quite beautiful.