I FINALLY got my sketchbook back from the Spring semester. It seems the instructor kept it, rather than returning it with the other students work. He didn't tell me he was doing that, but later he showed it to his classes as an example of a how a sketchbook can be used. While all the drawings are not top quality, they represent further exploring the topics assigned.
Later, after doing this sketch, I created a larger color-pencil version. I like this one better. I think the larger version is a little to lanky.