////Okay so briefly, what I want to accomplish is a sort of ground hugging fog effect in Poser 7.

I've spent several hours playing with the atmosphere effects in the materials tab, and I can make fog be in the distance, up close, and even make it start above ground.////

Alternatively you can do it in Photoshop or Gimp, which have a lot of benefits over doing it in Poser as you can change it very fast and save you a lot of render time and also you have full control exactly where you want it. Also learning to use either of these will not be time wasting for pretty much anything you want to do in Poser as you can retouch you images here very easy.

Anyway should you want to try doing it this way, then there is a good tutorial here as well on how to do it in Photoshop, but im pretty sure you can do it in Gimp as well or something very similar. The reason I mention Gimp is that its free.

Add Atmosphere (Fog) To Your Images - Photoshop CS5

This might be easier.

Easily Adding Fog To Your Photos in #Photoshop