IMO postwork is also necessary to get photorealistic renders. One thing is, strangely enough, to make the finished render into black and white.

And remember that renders are sharp all over. There's (under normal circumstances) no depth in a render. We don't always think about it because we're used to renders looking like that. But in order to attain PHOTOrealism you will need some depth of field.

Here are two examples of my own where I think I managed quite well :o)
Photorealism 9
Photorealism 6

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.