This has some very good shading. One of my favorite things about this image is the hair and its texture, its very pretty and well shaped. Indeed the neck is a bit long and possibly the body to thin, but it could possibly be to add character or style, which I take into consideration.

breast little too big, neck little too long Xd
But i kinda like that) Do something grey scale like this again :D
And yea, try to focus more on face next time, not on booooobs XD ofc if you can do that.