Neon Dragon. Setting up a body with 3 dimensions really makes a difference.
One exercise that was fun, in this tutorial by Jeinu, was to make a weird squiggly shape, and then make a face from it. The guy in the upper right corner is one of those and I think he came out pretty interesting. The cute lil' girl in between the spiral rings of the notebook was drawn by my daughter doing the same exercise. The thing on her head is a hat that might have shrunk in the wash. I also tried doing some old people and some homlier faces since these are harder to draw.