26-Second Upside Down Mirror Grayscale Face

Done as part of a practice session with poses of 26 seconds in length.

My current goal is: Improve my understanding of the forces of the facial skull, in terms of my facial anatomy.

Here is my latest first ever upside down mirror grayscale face, all sketched out boldly, in different shades of colors. As you can detect, I'm really paying attention to how I can distort and caricature a model's facial skull, in terms of the forces and energy. So, how do you feel, and how do you really think?