Muscle anatomy studies. I used a simple front and rear reference that labelled the muscle groups. I did a full body study, showing the more major areas where the muscles are showing. I believe on this drawing I could have worked better on how well porportioned the figure was, as his chest is rather flat, and his legs could have been better porportioned to his body.

I do think the side profile picture I did of the head went well, with enough detail to show more major muscle groups. I also did a side profile of a tensed up arm, showing a slightly bulging bicep, and the tricep more stretched out.