I used to really hate leaving a negative space to show light reflections on my pencil art. The white color pencil exists but, let’s face it, it won’t color over another color. Then I watched some videos of people drawing in 3d and noticed that they were using paint pens. I don’t know why I hadn’t thought of it but now my art has left the flat behind. It’s still a long way from 3d but it’s come a long way.