I teach my art 1 kids how to shade, but I teach them how to do it with a pen. I give them a quick pencil shading lesson, and then I show them how to shade with a pen. The results always amaze them. Pencil drawings done by kids are rarely done well because kids usually don't put enough contrast in their work. I have only had one student in my years of teaching successfully create a good quality pencil drawing. With pen, the contrast is automatic and the work looks sharp.