I thought I'd try my hand at smalls a while ago. At 4 x 6 this is about as small as I can get with this type of image. Back when I was doing a lot of illustrations for text book in Boston I did a lot of teeny tiny heads in pen and ink. Some with just a few pen scratches. The most important thing I had to represent was the ethnicity of the pen scratches. I used MGraham walnut oil based paints on this and good sized brushes. Not giant not small. Good size. It went quickly got pinned on the wall and forgotten. Here it is no longer forgotten.