It's interesting how much or how little some of my students put into a simple sketch warm up. Some students use the time to sit and chat to their friends and don't really even look at the drawing from different perspectives. Some students would spend (and have spent) the entire hour working on this simple half sheet of paper with the beginning of a drawing on it.
So, here's another cool one I wanted to share.
two different perspectives, same beginning swirl. Love it!