Kawecki, I don't see how the P2P server example applies here.

colbaltdream, it may have not been clarified in this particular thread, however, it has been clarified in other threads and, the thumbnail policy is not exactly murky on the topic.

It says:

No nudity. This implies no clothes, clothes that are transparent or blurring of nude images. 

So, no ... even IF her nipple were to be entirely covered by hair, she would still be a nude figure, so the thumbnail image would need to be cropped.

It also says:

No exposed buttocks – more exposure than a standard bikini bottom would constitute nudity.

So, PerfectN's thumbnail image showing no clothes AND more buttocks exposure than a standard bikini bottom would need to be cropped.

It's clear as glass to me.  I guess I'm having trouble understanding what part of the policy is unclear to people.

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I used this analogy once before, and I'll drag it out and dust it off, and use it again because I think it is the one that best applies.

In the US (and perhaps in other countries ... I don't know), we have a rating system for movies.  A director can make pretty much any movie he or she wants, but it is going to get a rating as to whether or not is appropriate for some ages and not for others.

Essentially, if there is a fair amount of nudity or violence, the movie gets an "R" rating.  If you can see the analogy between a movie having nudity or violence  and a piece of art having nudity or violence, then we are ok so far.

OK ... so we have this movie with an "R" rating.  If the director (or producer) wants to preview this movie to the public at large, then they have to come up with a "G" or "PG" rated preview in order to advertise the movie at G or PG film showings or on the TV.  That's why you see the "This film preview has been approved for all audiences" note on most previews.

The director has the right to make the film the way he sees fit, he/she and the producer do not have the right to show the nudity and/or violence contained in that film as a preview to all audiences.

OK ... so my analogy is that the thumbnail image is like the preview for your artwork.  You have the right to make the artwork anyway you want.  Renderosity is like the movie theather .... they can look at your artwork and decide that:

1.  It is too graphic to be shown at all in their "theater" ... and they take the image down (your basic porn); or
2.  The image is fine, but it's rated "R" and needs to have a "PG" preview for the preview area, or
3.  The image is G or PG and so a full preview is fine for all audiences.

Now, mostly the artists (like the director) want to get people in to see the movie.  They can't show the nudity or violence that is maybe what will bring in their target audience.  So, fine ... rather than just complain about the theater's policy of showing only PG rated previews (which by law in the US they would have to do anyway at a PG film ... but we'll leave that aside for the moment and just say that it's the theater's business decision), the director decides to come up with a creative way to preview the movie without the nudity and violence.

There's your challenge people ... see if you can't come up with a creative way to crop your thumbnails so that it is still an interesting piece of art without the nudity or violence.

Could be worse, could be raining.