A great overview in The Guardian of how illustrator PJ Lynch works in charcoals. Made me want to give it a go.
From smudging techniques to dramatic use of white chalk, Irish illustrator PJ Lynch has some useful tips on how to make great drawings using charcoal
See the full tutorial here – it’s not exhaustive by any means, but it gives you an idea. I’d never come across the tip to start on grey. Why did no one ever tell me that?