27-Second flipped face warm-up sketch

Done as part of a practice session with poses of 27 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 a really, really rougher and cruder scribble warm-up of a face of a samural pose and expression. Watch closely as we can feel the drama and intensity of that expression, with a lot of vitality, and a lot of energy. What do you think of this?