Here's a movie I made of me drawing a horned demon beast dude, drawn on toned scrapbooking paper. It works well with the white-out pen, but soaks up the lower numbered Copic grays. Finally figured out I needed to go to at least a Cool gray 6 for it to be effective. Total actual time was around 25 min. Music is The Chronomancer II - Nemesis, by The Sword from their album Warp Riders.