Okay, so here is an updated/adjusted version of my previous marker brush. [link]
Basically, it's softer, and I messed with the saturation and color purity, as well as the texture scaling and depth. You could probably do it yourself on the old one, but thought I'd post this, as I have both presets saved.
EDIT: EITHER USE V3 OR CHECK THE COMMENTS; ONE OF THE POSTERS MADE THE TEXTURE SEAMLESS, SO REPLACE WITH THAT ONE.