oh!

that has nothing to do with the render settings.  it has to do with your lighting.

given your process was:

1. loaded figure.
2. worked lights until the figure looked good.
3. props look washed out.

the lights are the problem.

what you want is a skin shader that works with other elements.  the general problem is that most character makers spend some time getting a good skin shader, while most prop makers don't bother to use anything but a texture and maybe a bump and displacement map.   developers can't hold up their character quality because prop quality is low.  generally speaking, what you need is for prop makers to improve their work,  or learn to translate material techniques to your props. 

that said, there's a lot of tools that can help.

Poser Pro's gamma correction should help overall.  are you using it?  also, this specific skin shader looks fairly inaccurate.  this is the kind of problem where it would help to know more about your lights (type, placement, intensity), your props (materials, placement), and what you're trying to achieve. 

bagginsbill is the man when it comes to lighting and materials.  and ice-boy follows his work closely.  you probably want to focus on what they have to say.