You picture is not showing. I think someone has disabled your image because some people feel that the NSFW tag is not enough that the first image has to be censored, and some also feel that even a censored image is not enough.

But to answer the question...

To me it's the intent behind it when it was created and vibe at the time it was created.

There are many categories... Nude Art that is not sexual at all, Erotic Art that has no nudity at all. Erotic Art that is sexual and has nudity. There is also explicit erotic art. Then there is also Artistic Porn and Non-Artistic Porn.

It's all labels and perception. The Puritan crowd will call anything with any partial nudity Adult or Porn. But you can't take them seriously.

I'm presently working to bring in more models, adult performers, and their fans so that it will help Steemit grow.

You can see examples of several kinds nudes on my page and non-nudes as well. All of us that create Nude/Erotic content need to support each other on here I upvoted you.