The drawings below were done 3 decades ago and they were a different approach to how I was drawing previously. They were drawn with white conte and white dry pastel. The strongest lines were applied with the conte while the softer tones were added by rubbing a soft pastel onto a paper towel and then rubbing that where needed.
All the drawings were done from life. It's a quick way to do a drawing which can be useful in a life class as the poses at that time were rarely sustained. The top one was a longer than usual pose but the other two life drawings would have been either a 20 minute or a 40 minute pose. I can't remember how long the still life bust drawing took but in a way it's irrelevant as time wasn't an issue.