Houdini NPR rendering

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I am starting to experiment some Non Photorealistic Rendering. First I am starting off with non animation Versions.

simple point replicate rendered disc’s:

Houdini viewport:

constant shader in mantra:

Working out some edge strokes and rendered with toon shader:

this time i trying to create fake occlusion with point clouds to create same NPR

I’ ve added some displacement to simulate brush strokes:

I am trying to get some pencil lines into the rendering. First tests, I am using instanced polygon lines.

I use some method like in this digraph paper to create a saintly look.
http://isaacbotkin.com/siggraph/
The rendering is slow and its hard to a get good reading on detailed Models. But it works much better for low poly models.