26-Second Flipped Facial Expression Warm-Up

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 facial expression warm-up. I've really loosened up my facial skull on this gestural sketch, here, in terms of forces, in terms of vitality, and in terms of energy. What do you all think? What can I do to polish it up, or am I all set for now??