26-Second Flipped Face Warm-Up Sketch

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 my facial muscles, in terms of my facial anatomy.

Here is my latest practice warm-up sketch of a face. As you can tell by the manic energy and feel of my scribbly practice drawing. As you can see, I'm drawing longer and larger and larger. What do you all think of this?