I really like the colors in this piece and the way you drew her hair. I also feel like the grunge-textures add a certain depth to the picture, so well done!
However, I feel like the proportions on the face might be a little bit off . It look like she has a very protruding jaw, whereas there is almost brow to be seen. Maybe changing the features just a little bit, in order for them to balance out, might help?
However, overall the piece is really nice, and as I said before, I really love your use of textures here. Instead of just slapping them on, you really blended them in with the piece so they work.