Here are the same 3, but also included is the stock figure and naive shaders.

Again, if you are interested in non-photo real (NPR) shaders, then by all means do whatever floats your boat.

But to me, the stock M4 looks unreal - interesting, artsy, but unreal.

I (and others) have dozens of interesting NPR shaders as well, such as my Vargas airbrush style shader. All can be applied and managed using VSS.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)