See the Arnold gallery for toonshader, or search the web for more examples.
Talking beyond the toonshader, notice in the ink/water-color artwork there are many uneven and soft lines, which would be hard to model, unless you go for 2D cutout style, where you can have RGBA texture with real soft brushstrokes. And then, isn't it easier to do something like this in some compositing software, like After Effects with DuIK rigging plugin?
Otherwise, you can do models, rigs, animation in 3D, rough shapes, caring little about the edges, and render out EXR with depth, normals and UV channels. In the compositing software then you can make jagged contours, apply textures, stylize fills, blur and distort. It will give much more control over the pixels.
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Maya2019.1 @ Windows10 & GeForce GTX1080Ti
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