This is a really nice piece, the shading is really lovely and it really blend with the use of colours well. You also have a really good use of anatomy and detail in this piece, especially in the hair. What I would work on more is the background for starters.
There are lots of intricate details in the model, but as you can see with the scene there are quite large, blotchy circles and not as much little details which really take away from the overall picture.
I'm also not sure is this is just me but her jaw is really square. I have no problem with that but even though being square looking at it maybe it should be just a little softer.
I'm also not sure if this is you're choice, but her necklace looks a little wonky. If that's intended, however, then it's fine.