Postwork is...

 

Well, depends how much you do...

 

Retouching render artifacts, smoothing out kludgy bits... fair enough, but when (as written in a tutorial in a professional 3D magazine) you start saying stuff like "hand painted reflections are superior to raytraced reflections", then perhaps you need to give up on the 3D, and concentrate on 2D, be a painter.

 

It's all a matter of how far you take it.