28-Second Flipped Upside-Down Colored Grayscale Expression Warm-Up

Done as part of a practice session with poses of 28 seconds in length.

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

Hey there. This is my latest dynamic line art warm-up sketch. As you can see, I'm working in extremes here. Extremes by quick gestural drawing, as exemplified of this scribbly face. But I'm really having fun with the dynamism of the funny faces. So what do you think?