This article follows steps using Smith Micro Poser 7. Several of these steps become easier in newer versions of Poser.
You will want to align your light so that it matches the light source apparent in your background.
A single light source will not produce a completely realistic scene. Experiment with adding additional lights.
Poser Pro 2012 includes and optimization function for using HDR images within Poser. Read the article Optimizing for HDRI in Poser Pro