I use sanded chalk pastels for stubble. I rub the stick on a nail file until I have a pile of dust. Then I dip the brush into the pile and lightly rub the brush on the area I want stubbled until i have the desired effect. I learned myself to paint because I am cheap and didn't want to wait several years for a head to come back from a painter. I have been painting for a few years and every head is better than the last (even the dreaded eyes) and I have the added benefit of being able to say I did that when it is finished. I am no Boot25 et al, but I have fun.