If you haven't already (which I can't imagine) I'd just surround my workstation with photo references of people from all angles in various poses and scrutinise.
It might also be advantageous to get a better set of shaders (without textures) to do test renders with while you're tweaking. I worry that some of the heavy shadows may mask problems you haven't noticed yet.
Maybe try with bb's PR3 shaders with no maps attached.

 

PoserPro2014(Sr4), Win7 x64, display units set to inches.

                                      www.danielroseartnew.weebly.com