Shading complex colours

Hey, so it’s New Year’s day and I thought I’d start as I meant to go on with a bit of a practice at shading. For this I decided to start with some basic shapes and then try some more complex body forms like an arm. So here is my notes for this morning. They might be useful for someone looking at shaded areas, mid-tones and light. I drew this in pencil simply because I couldn’t find my pen but it’s all cool.