I've always loved a lot of detail in my paintings and when I was first starting out then I'd buy very fine sable brushes. Unfortunately, I would quickly wear the bristles off these expensive brushes, so I'd use the quick. At some point it occurred to me that the brush end was basically a twig... and I had a whole box of twigs in the kitchen called toothpicks. This has lead to being nicknamed the 'toothpick artist' locally. So I use a toothpick, sometimes as a fine knife, roller, etc.. It really is a quite interesting tool, this portrait was painted almost entirely with a toothpick.