What kind of definiton do you want? Anything we say to define will be argued, and more definition piled on- that's exactly what we are trying to avoid. Most mature adults know what is and isn't good for a juvenille figure. Most also know the difference between, say, a fairy looking cute and a borderline image with pointy ears, by someone using that to slide by. If anyone sees anything that needs looked at, it will be discussed between the artist and all the staff. That's the best we can do to keep from making a thousand rules to be ultraspecific.