Flipped Grayscale Face 30-Second Warm-Up

Done as part of a practice session with poses of 30 seconds in length. My current goal is: Make my forces of faces and expressions less stiffest and more dynamic,energetic, and fluid. This is my latest warm-up. Yes! It's all monochromatic! I'm making greatest strides in perceiving movement and values. What do you all think of that????