What, if anything should I adjust? Because when I try to follow your advise and gamma correct my Poser render to 2.20, then the resulting render is blown out too bright. The most I gamma correct my renders is 1.00. 

"A lonely climber walks a tightrope to where dreams are born and never die!" - Billy Thorpe, song: Edge of Madness, album: East of Eden's Gate

Weapons of choice:

Poser Pro 2012, SR2, Paintshop Pro 8