I’d done this as a homework while I attended Max The Mutt Animation School. I only did the year, but I learned a lot while I attended.
This was actually one of the easier homework pieces. We were given a picture of a horse with a rider on it, and were told just to get the shading right using cross-hatching, and that the shapes were as close as we could get (like the shape of the horse’s head)
Done in pencil