Started using Cretacolor's XL Nero Art Sticks here for light values and halftones in place of the Prismacolor Art Stix. They're less waxy. And wider. Much wider. So they cover a lot more ground in less time while still allowing for sensitive restraint in building-up values. Which suits them well for life drawing—where time and control are at a premium due to the fatigue factor forever taxing the model.