I've been painting checkers on my Bretonnian knights for a while now, but the checkers always turned out to be larger on one side of the horse than the other.
Never thought of using a pencil, so this might be the solution.
But can you really see the lines you draw on a model that's been primed with Chaos Black? I definately need to try this.
I give this guide 8/10, since you could have shown if there's a difference between models made out of metal or plastic. You could also have showcased a few other models you made yourself with this technique instead of just the Harlequin wich was only half-painted.
Anwyay, kudos.