I didn't want to fill too many pages with warm-up figures so I chose to work small. This page has 30 second, 1 minute and 2-minute poses. These were created with a rapido sketch pen and filled in with watercolor during the model's break.
We moved on to 10 minute and 20 minute poses. I worked in a Japanese felt tip pen that has a gray tip and a black tip. My strokes seemed to get more confident as I progressed which resulted in stronger sketches.