This is a sketch of my clay face from the previous post. The paper is Canson Mi Tientes in some shade of buff with Prismacolor pencils in White and Sepia.
The color choices for the pencils and the personality around the eyes are pleasing. However, I'm less pleased with how the mouth and chin look. It's obvious from this drawing (and another that I'm not posting) that the anatomy of the model's mouth and chin are not correct.
Until now, I was confident (perhaps overconfident) that I had a good grasp of facial anatomy. Certainly, I can draw and paint the face and portraits with some aptitude, but that's just not the same as making a 3D model. This has really shown me where I could use some more information.
So, that started me on a study of facial anatomy. First, I'm making a study of the skull and then the muscles of the mouth and chin. Look for those soon!