Hello again.
Now, you've mentioned Poser 7 over in the forum where the riff raff go!
If you really want realism in your work, do it in Vue, to put it bluntly it dumps all over Poser!
You've got to work those lights. Global Radiosity & Global Illumination are wonderful features. Longer render times but it'll set you on the way for extra realism. Getting a good HDRI can help as well. Any of these 3 will give you the basis for realistic environmental lights.
The Quadratic spot lights are a beauty in Vue, work with the spread & falloff to get the effect you need. I also love working with volumetrics.
The basic atmospheres with Vue are very good, tweak them to give you even more of an edge.

Peggy is so right about the shadows. Only have them dark if they need to be, if I'm doing a general outside render I'll generally go around 75 - 80%. I like to use soft shadows as well. Again, it can hit render times, but it's worth it.
When I import from Poser I work on all the materials, changing specular, bump, colour etc. Basically trying to improve the materials to work with the lights I have in my scene.