Categories of emotion as defined by facial expressions. It's good knowing this when you have a caricature you're carving. I really enjoy crossing over the lines and mixing two of these together.
Men's Faces by JoniGodoy.deviantart.com on @deviantART
Clamping, forming leather
XF.Three Steps to Beautiful Hips by OliverBarraza on deviantART
Sketchbook Vol 1. Karl Kopinski Collected Sketches.