Not strictly related to the galleries, but what makes me groan with despair for humanity is when I see a picture where the hair is obviously composited in from a photograph, and then a comment along the lines of "The hair looks so realistic!" smacks head against wall

Like cobaltdream said, oftentime images rendered in other programs, but created with Poser characters, get slammed by those "purists" who use said program (3ds, C4d, etc). And if a Poser character is simply rendered in another program, would it belong in that category just BECAUSE it had been rendered in it?

The problem with mixed medium is that there ARE no definitions really for what mixed medium IS. Does a simply auto-color/contrast/levels in Photoshop count? Does 40 pixels worth of postwork to correct some dodgy joints? If 85% of the work is Poser, should it be Poser or Mixed Medium? 

Let the artist decide.