I've started doing what I describe as a CNC coloring book approach. I take an image and bring it into Inkscape and trace the image. This gives me an outline of the art and the highlights within it. I then save this as an svg file and bring it into Fusion 360. In F360 CAM, I use the trace tool and select the paths I want traced. I then rout those lines using the S03. Now I sit down and paint between the lines just as though I were coloring a page from a coloring book. Here's one I just completed
http://www.hilinski.net/woodgames/showm ... gilant.jpg. There's no reason the router couldn't be replaced with a marker to create the coloring book lines. In theory, I guess, you could create a pocket toolpath for each colored area and use a pen in the CNC to fill the area. This is hardly any different from artists who use a projector to project an image onto a canvas and use that as a guide for painting/drawing so it's not a novel approach. (note: credit Shutterstock for eagle image).