Quote - moriador, "I find very, very few renders of poser people to look particularly real. There are too many things standing in the way"

That is not any special just for Poser. 3Ds max, Maya and C4D or any computer software inclusive Renderman and Disney studios have this problem. There is one one way to do it and that is by postwork. Like addy do and a few others.
<a href="http://www.renderosity.com/mod/gallery/index.php?image_id=1189652&user_id=122068&page=3&member&np">realistic Poser figure

So the great majority doesn't even bother to try... That is what I find rather - sad.

There's either a lot of photo layering on that image or a lot of painting. I've certainly seen some traditional art on canvas done with acrylics that could pass as photorealistic. But if you're going to paint, then paint. Why use poser?

To wit, same artist:

http://www.renderosity.com/mod/gallery/index.php?image_id=2144323&user_id=122068&member&np

The whole reason so many people use Poser is that they either CAN'T paint like that, or because they don't have photo references (essential for both of those example images) for the sort of things they're creating.

And many don't try because they don't want to create photorealistic images. I'm one of them. I make illustrations, and sometimes toons.

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.