We are used to seeing photos when we see images that are "real" You could try desaturating and adding noise/grain. I great way to do this is with the free Virtual Photography Photoshop Filter... were to get it I can't remeber. Also dark sin is wrong at sholders and knees could be darker. Sharpening the image often helps offset the softness of Poser Renders at mid-distance. Finally the mess in the hair is lost as you pull away... messing it up again in post-work might help, especially were the highlights in the hair are showing a perfect band. Armpits should be quite light and with the suggestion of stubble. The real problem as you pull out is the loss of bump noise giving super smooth skin. I sometimes brush special gray scale skin texture over in post-work.