Im Sorry....

This is very simple, not too flashy, not lack detail either. It captures the feeling of regret in Xion if you put your mind to it.

However, I feel I have seen this before. Can't remember where. I do suggest a more somber expression because her last words were meant to be sad.

I will say that you did a good job at capturing Xion though, the blue eyes are really drawing me, like she's staring into my soul. I actually like the way you made her look, like she wanted to say something, but also was mad while saying it.