Here is the progress so far:
This matches the previous sketch.
Playing around with the squash and stretch.
Playing around with the shape of the head and the placing of the face.
More trial and errors. Chuck Jones said his art teacher's would begin class by saying: "All of you here have one hundred thousand bad drawings in you. The sooner you get rid of them, the better it will be for everyone."
It may seem like the drawing is devolving but I feel I get so much out of these exercises. I sometimes end up throwing away the whole drawing and starting over. Although I really like the hair in these drawings.