Hi khorin, nice piece you've got going.
You started with a really strong, flowing gesture, which was really good. However, you've started to break this by moving the hair out of line with it. Think of the figure as a few strong lines of motion that the eye follows. All aspects of the figure should pull together to communicate these lines. So even though it might not make so much physical sense for the hair to curve (well, she could be twisting, it makes sense to me), you should have the hair follow the line of the gesture.
The shading needs tightening, I believe. The black you have in your palette is really a waste of a very precious slot in your colours. I replaced with a pink that can buffer between the higher parts of the palette, and be used for shading the skin more. Lightened the second darkest blue, too.
The other issue I think is composition. You need to balance it more, give more room for the eye to relax. Negative space, in other words. I dulled the bottom-left corner to add interest and to stop the eye leaving the image there, and also to balance an emphasised top-right corner. The swirls in the right of the image need less dominance and more of a selected accentuation in order to make them work within the composition.
The idea for the swirls in the hair is really great. Emphasis it both with the hair's silhouette, and with the shading. I only did it a little here, but you could really incorporate the patterns of swirls into the shapes of the shadows and highlights.