What is obscene? Obscenity has a three pronged definition, and as I understand it, all three have to be present in order to declare something obscene:
a) would an average person, applying community standards, find the material morbid, shameful, and an unhealthy interest in sex;
b) does it depict or describe certain sexual acts as defined by law in a patently offensive way;
c) would a reasonable person find the material lacking in serious literary, artistic, political or scientific value.
I don't want to give a long report about constitutional rights or legal definitions. But I do know people who would consider this photo pornographic and who also consider public nudity indecent and obscene. The human body in this context is neither.