The model, Ulrich, is German American. He is fluent in English, Spanish and German.
He volunteered to pose for class with Martina.
I didn't use a single light source, instead used a florescent light from the ceiling.
It was a little hard to capture the subtle value and color temperature, but I studied subtle cool color temperature on his face and luminous facial planes.
Tonal sketch on primary wash.
Completed in 2 and half hour.