Anyone can learn to draw if they put in the effort. Even me! As Banksy said, If all artists are prepared to suffer for their work, why are so few prepared to learn how to draw? Well, I'm learning, and so far I've picked up some useful and interesting styles and techniques:

Check out my silverpoint page

See what a little photoshop can do...

A great technique for drawing grey hair: scratch into a heavy paper with a sharp (ish) edge, they lightly shade over it to create thin, white hairs: