skin texture and lighting can give yo an excellent result in poser, but for realism there are lots of tiny things , like muscle tone and hair, that just are extremely difficult to look right.

In 3dsmax there were long battles between skin shaders that are probably still going. There is also a situation where the 3dsmax user is a modeller and will make small changes t the figure itself to get the pose and expression exactly right. 

Check out the gallery at cgsociety for some excellent work.

For some reason head shots in Poser seem to look better than pictures including the body. I have never understood why that is .