The Bubble. Artist: Harriet Whitney Frishmuth (1880 – 1980). Crystal Bridges Museum of American Art. +2
Typically this tag is used for photographs featuring artistic nudity, as opposed to casual nudity. Generally (but not always) the principal subject is myself. As to what counts as casual or artistic nudity, that’s just a subjective call that I have to make. If you are easily offended then move on.