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here is a full list.
Steven Zapata's Secrets of Shading
Some of you will have noticed that Drawabox doesn't teach shading at all. Rather, we focus on the understanding of the spatial relationships between the form we're drawing, which feeds into how one might go about applying shading. When it comes time to learn about shading though, you're going to want to learn it from Steven Zapata, hands down.
Take a look at his portfolio, and you'll immediately see why.
