Here's an example of what I wrestle with.

Four renders of V4 under the same lighting scheme (EnvSphere with HDR map plus 1 inf light) - bear in mind there's some colour coming from the environment lighting.

Each uses the same material setup with the exception of slight variations to the HSV node settings between the scatter node & diffuse maps. From left to right theres a slight decrease in hue (reddening the output), an increase in the saturation, and decrease in value. It seems subtle but overlay one atop another and flick between them and there's quite a difference.

Which looks more natural?

 

PoserPro2014(Sr4), Win7 x64, display units set to inches.

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