Since I couldn't understand where the face planes are supposed to be (even while looking at tutorial books) I tried to draw her skeleton first & ignore the muscles (since I got her screenshot reference with neutral expression).
I still struggle with the face planes too mostly because I usually don't render my drawings and I am more comfortable with the anatomy. But it is a nice tool that I will definitely give it a try. I think those face planes are much like the building lines with time and experimentation you will find a set of planes that makes sense for you. Also there are some planar skulls that are great to draw from http://planesofthehe...head_detail.php
I really love how you made your head construction, especially the nose.
Nose is a nightmare for me, more than the ear, but it is the same as the planes of the head, each book shows a different set of planes, and sometimes you will need to change your set of planes depending of the type of nose you are trying to build. But again it requires time and experimentation.
Do you learn anatomy by yourself?
Figure drawing, and character drawing in particular, is what I like most and my main goal is to draw them from imagination. So with that said, there is a DVD called The Structure of Man that I have bought years ago that goes through the process of simplifying the human anatomy (skeleton and muscles) to make it easier to memorize, almost 200 lessons. I am not saying that the author is an amazing artist, nor that the DVD is for everyone, and looking back I would question some of the material presented on the DVD, however the methodology of repetition and simplification of the human form helped me a loot, combined with some good anatomy books around, and drawing every single day for two years, yeah lots and lots of drawings, but I improved a lot. Unfortunately it was a long time ago... 
@ Al - Please feel free to share all your studies 
Ok, will post them. 
Thought you might like to see how I start my construction lines for anatomy. I know, I have other projects to work on, but I wanted to do an anatomy study 
Oh that is a nice pose! *wonders who that is or will be* 