I think artistic nudes are about form and light.
I think erotica aims to titillate. Where you draw the pornography line has to do with your own head. For me, it is determined by consent. And erotica that doesn’t have the consent of all participants crosses that line into unacceptable. That includes putting up your own photo of yourself being erotic where I will see it without warning me that you are going to show me your sexuality.
If you say “There is erotica here” I can choose to participate or not. If you put up a photo of you slipping your hand into your panties or your dick slipping into your willing partner without a warning, you have become a pornographer because my participation was without my own volition.
And work no longer has anything to do with “NSFW.” That has become code for “there may be nakedness here.”