I use both Photoshop and Painter for smoothing and fixing the rendered 3D models then also I paint in clothing, hair, anything else I think the image needs. Also I comp in pieces from my own photos to make backgrounds & add textures . I adjust lighting or change it a lot in postwork , colours too. I don't even do the Poser renders on a  high quality setting anymore,  the one for this image was a 'draft' setting though I do render largish, say 2400x2000  so it took 1 1/2 hours in Poser to set up and pose the figures, 15 minutes to render and about 6 hours in Photoshop to do this image.

I'm one of those mentioned in the above post, for me Poser is a tool mainly to set up figures..  all my fun is in the 'postwork' and mixing media  though I do certainly admire folk who use just Poser or D/S with very minimal postwork and do very realistic renders with it .... however that's just not where my personal interest lies.

" Try and be nice to people, avoid eating fat, read a good book every now and then, get some walking in, and try and live together in peace and harmony with people of all creeds and nations."
-Monty Python