Nudes on Instagram?

Hey guys,

I know that there are several restrictions regarding nudes on IG.
I recently wondered which pics are getting busted by IG and which not.

example: https://www.instagram.com/p/BSZLtOZlXhG/

Where is the border on which IG says: NO! ?

Im planning to publish photos like this:

[​IMG]

Do you think this works?