It pretty much comes down to a matter of one persons taste. not principals or legalities.
    It only takes one person to find something offensive, to ruin someones work and others enjoyment no matter is its nudity violence or whatever.
here the pen is mightier than the sword where what the mods say goes.
    Another problem is as in one of the earlier posts talking about "child porn" well here in the US nude figures of ANY age is legal depending on the pose, circumstances and state law. where of course anything that is gratuitous is illegal. 
    I can legally buy and own something by David Hamilton, Jock Sturgis, Sally Mann and whoever else has nudist type art. however if one pic of a 13yr old is posed in penthouse fashion well then the crap will hit the fan and rightfully so.
    I did not see the Utopia picture but just from the head shot it looks as though the picture may have been in portrait fashion which is totally legal, but this site and some members of it decided either the pic was in their mind distasteful or better yet too close to crossing the TOS lines and decided to ban the pic.
    This site will probably come down to one of 2 things either A: all nudity will be banned cause one person does not find it artistic.  or B: all nudes must not have a facial shot and breasts must be bigger that a C cup cause any smaller than a C means the girl is underage. not to mention pigtails will not be allowed cause that suggests underage as well.

I guess in a nutshell how does one determine whether or not ones pic will be appropriate.
Well if the thought ever crosses your mind will my pic be removed? then the answer is it probably will, if you  asked yourself that question then it's probably too close to crossing that line.
just my two cents.... and of course sarcasm is free  :biggrin: