Poser is capabel of very realistic images. It is not the software but the limits of the artist. Poser 12 has a lot of tools that can mimic realistic renders. 

This image is done in poser 12. I tested la femme. I agree on a lot of things said about her. I find her hard to work with but it can pay off. I painted the skin in zbrush, no photos used. Also morphed her in zbrush. My only wish is better a hair engine and cloth engine.