Ahhh! The Goodyear Blimp Syndrome!  I was dumb founded by that myself.  As the others have said,  you need to uncheck "Smooth Polygons". I don't have Poser open, but I think you do that by selecting the item in the Pose window and using the parameter dial properties to turn it off for that item.  Then you can  still render in Firefly with "Smooth Polygons" checked, and the only item that it won't apply to is the ones where you have turned it off. 

"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