my approach would be to learn how to draw and do something original based on
poser renders as reference imgs, if one is desperate to be involved with said site.
it's well-known that pen/pencil artists have scorned poser users for the last decade.
the reason is that poser democratised the creation of images containing people
and animals, which became an immediate threat to those who had slogged thru
art school and fought tooth-and-nail to get comic book jobs.

I know that those things were held in low regard by the general porno community
when I was still doing porno, but I dunno if the fbi or interpol monitors those things. 
probly not.