Looking good!
This one has what I call the outline shading, where the shadows look almost like a secondary outline. Pick a side that the sun is coming from and stick to that, and only shade on one side of things. The top side of the dress is a good example. The light source there is clear. I kind of wish you'd continued the shading down the side a bit more, since the dress looks too bright to be in the shadows down at the bottom. The hair might also be a bit too saturated, and maybe the shading on the forehead, as well. Also, be careful not to make things too fuzzy. It starts making things a bit difficult to separate and can ruin things you were careful to draw. Drop shadows from objects (or hair, even) are pretty sharp, so they should be the least soft of the shadows, unless it's from further away.
Remember to think of body parts as a series of shapes sharing a light source. There's an amazing amount of little shapes in the human body, but it's better to start with the general and then work your way to the smaller parts.
Maybe this could help a little.