Played with a couple of my new pencils to sketch at the beach and start learning the arm muscles. All these diagrams keep reminding me of my physiology course in high school. From what I recall, my favourite muscles were the tensor fasciae latae and the sternocleidomastoid, and the sole reason was that they were fun to say. There was also the day we got to go study the cadavers. The muscles looked more like cooked chicken - flat as far as shading goes, fibrous, and difficult to tell apart.
Also painted a picture as a form of stress relief.