http://www.renderosity.com/mod/forumpro/showforum.php?forum_id=12474

Try posting your images in that forum and asking not only for general feed back, but also suggestions on what you can do along with details on how to do it.

I will say that there is really no substitute for good lighting. Check out these threads for help on that:

Olivier's Making of a pomo pic
Castle Poser Tutorials
Poser 6 IBL Ins and outs by Olivier
A little tutorial about lighting by Olivier
Tutorial: GEL MAPS by Olivier
How Light Probes are Laid Out
Advanced Image Based Lighting in Poser 6
Basic OpenGL Lighting

There are also lots of tutorials on how to post work your images, both here and at Daz in the tutorial areas.  Most images in the gallery are post worked at least some, and many have "Photshop Actions" and/or other filters applied to give a softness to them too.  So don't feel badly that you can't achieve those images strictly inside Poser.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi