I have never wrote a word about this point since when I became the only responsible for this group, but as I have declined many submissions requests lately I'd like to make my position a bit clearer.
The previous Founder used to accept almost everything here, but I have a slightly different conception; I would like this group to stay a clean and nice place so, please: submit only the best of your artworks! With that, I don't mean that you have to be Michelangelo or else to see your pieces here: just make a little selection of what you produce.
And most important thing: no vulgarity. Nudes are ok, porn is not.
I can give you more details if you need them: feel free to ask!
Until then, I wish you a nice stay.