Sketchbook homework often included copying a Master drawing. I hope to continue with this exercise because it was extremely helpful to study their particular styles.
DaVinci’s horse, a study of how architecture imitates the human form, Michelangelo’s figure:
Flexing My Wings 
whoa! architecture and human forms? Is that your study or a copy of a master’s? Because it’s fascinating!
That architectural page was assigned with a handout from Jacob and did not have the name of the Master on it. It makes me think of some of the Michelangelo drawings, but I haven’t investigated. The other two I chose so I knew where they came from.