I've re-established shadows on this stage. It is a very necessary step. If I don't do it, I'll easily lose my place as I continue to build "light" upon the subject. Next step will be to bring "light" into the painting using Naples Yellow.
Also, on a side note, if you notice, I've glazed "blue" color onto her neck. A truly classical painting will have blue on the neck, red on the face and yellow on the forehead. I don't know why this makes it look nice but it works!