hborre, at a glance, it looks like a shader needs to be set for each material groups and not applied to the whole scene.  In that case, wouldn't it be better to exclude small elements like eyebrows from the settings?  In the first place, hair doesn't completely block lights, so it doesn't cast a pitch-black shadow, right?  Maybe if the eyebrows had a more realistic shader the results would have been different.

There's something wrong about my SSS settings, but the darkness of the bottom shadow seems different.

But isn't this shader a texturing technique that quickly expresses the presence of objects in 3D games?  Since RGBRump was not available in Poser12, I searched the internet and found an example that uses Gamma in Blender.  This shader can be used to enhance the shadows of objects and add color to recessed areas without using Photoshop.

The red one seems good for expressing the vase being hot.