this tool is what make it possible to draw my art with extra-detail and light effect :D i recommend this tool if you are already good at shading but for beginner use the highlighter as a shading how to shade with a highlighter 1.choose a color the have a darker tone on it (ex. the base color is red you must pick the darker shade of but you must still stabalize the base color and your shading) 2.use multiple darker shade of it if you want 3.put just a tiny bit of a shadow if necessary