Excellent facial expression warm-ups, mike_ok, yet, I've got something to say: I love how you get down into the broadest strokes, so, why don't you please go wildest with 26 more minutes of 29 second sketches of airs? Why???? Because, it'll make your improvement of, not only rendering the faces, but also, your facial quick sketching and speed.
Hope it's been completely and totally applied.