what i  do is i writte some info about my render.

with CGI every render is perfect clear and sharp.so for realism i blur a little my render. i tell this to people. plus after rendering i always play in photostop for 10 minutes with color. to correct teh black and whitte in the image and a little color correction. its still a poser render but some color correction never hurts. if i would do DOF in poser i wouldnt mention it. but if i do it its from photoshop because its faster. plus i also do some lens flare or subtle glow with bright lights. its all done in photoshop.
but more then 80% is still from poser. its a poser render. i almost never do paint touchups