12-Second Flipped Grayscale Face Warm-Up Sketch

Done as part of a practice session with poses of 12 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 progress on warming up my face's forces of my facial skull. It's apparently of an Asian girl, who shall remain nameless, all rendered with as fewest lines as possible. So, what do you all think?