The other evening sitting in on the Character Design class at my school I used the opportunity to teach multiple lessons. Among them a head rotation and also some basics in tonal rendering and texture.
I asked my students how long they thought it would take me to do a simple head rotation for the design I had in mind. I did this in 15 minutes while interrupted twice.
Here are a couple more concepts for the character I was developing. I have an idea emerging as to who he could be. The drawings are in blue pencil and I plan to finalize them with black line at some point.