Here's another tut on lighting that you may want to experiment with.  I've had some excellent results.
http://forum.runtimedna.com/showthread.php?70674-Lighting-amp-Rendering-in-Poser-Part-One/page1

I use Bagginsbill's, and he also has several other items you may want to dl for your work: https://sites.google.com/site/bagginsbill/free-stuff/environment-sphere