Postwork is always an option, but my own preference is to get the lighting and materials right within the Poser 3D scene. If I then decide I want to render the same scene from a slightly different angle, I don't have to do the postwork all over again.

When working on one small element of the image, you can do quick area renders over the top of a full render; you don't have to render the whole image over and over again.

It would be good to see an example of your 'dull' eyes, Blue_Boy. It might just be a case of increasing the diffuse value on one or more of the eye material zones, or making sure you get some specular highlights in them...  it's so difficult to say what's needed unless we can see what's wrong.

Izi
:O)

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)