Stéphane (Wootha) Richard is a concept artist from Lyon, France working in the TV, animation gaming and publishing industries with an talent for creating rich environments and using techniques you wouldn't normally think of for incredible results.
Some of his latest work is the development of a 3D scene in ZBrush that is taken into KeyShot for rendering using the toon material to achieve the look you see in the images here.
"In this tutorial, I'm covering the various techniques I use to create a highly detailed drawing from scratch using ZBrush, KeyShot and Photoshop. I'm also sharing with you presentation techniques to quickly add color to your line drawing to convey the overall intention of the scene."
The Comic Book Style Illustration tutorial is available on Gumroad and comes with 1:30 hours of HD video content, PSD files, ZBrush files and KeyShot scene file, along with a 45 minute bonus video on line generation techniques in Photoshop.
You can name the price you want to pay for it, but it goes up in price occasionally. Currently, the base price is $9. You can view more of Wootha's work here on Artstation.