It is a very interesting question you raise about the line between porn and art? As an artist who specializes in the female form, this is something I have also thought much about. The way I look at is very similar to what you yourself suggest. Occasionally someone who comes into my gallery feel unsure of what my motives are for painting women. I ask them one question: You you think the image is sexual or sensual? So far not one person has used the word "sexual". I then go on to say that I am open about my nature, meaning that I am a heterosexual male. Therefore it is written into my every DNA to like the female form. What excites me, as an artist, is to try and see if it is possible to still see the female form, appreciate it for its shear beauty,but at the same time, transcend the reproductive male sex drive. I know that might sound crazy, but that really is my true motivation.

This first time I thought about this as a "concept" was after I watched the 1908s film "Some Kind of Wonderful". One of the characters, a tom boy type, says to a boy she secretly likes "it must be a drag to be a slave to the male sex drive" . It was not until that moment did I realize that perhaps was actually "slave" to this drive. I began to look at myself differently. I realized that whenever I tool a girl out for a meal or on a date, I was not being completely honest with her, in that I was not seeing her only a person. Not to say I was disrespectful, actually I am the very opposite, I mean that there is always an underlying hidden motive,,especially if there was an attraction there. I mean it´s nature right? The law of attraction.
Anyway, I decided to purposely try to overcome this "male sex drive" so that I was in control instead the "drive " being in control. If that makes sense? Well to cut a long story short, after years of trying to conquer this, I was eventually given a great reward in that I began to be able to talk to women without seeing them as a potential mate. This then opened up an entire new world for me because I began to see the inner beauty in the "woman-being" that I completely missed. And that just blew me away. I know that might sound cheesy but I genuinely mean that. I guess I am saying is that I discovered there was (for want of better word) a spiritual side of the woman-being.
So I began to see if I could paint this inner beauty. But then that did not work either. I mean it´s a paradox right? If a guy is not gay he is gonna like a beautiful woman. To deny that truth you are either denying nature or you are lying to yourself and that is not healthy. So the only answer was to try to paint the inner beauty and outer beauty at the same time. Not easy.
How to do that in photography must be just as difficult.
Saying that I think you definitely have achieved that here. I see this wonderful photo as sensual and NOT sexual. And also very beautiful.
It is not easy but it is possible to find a balance. And the fact that is is not easy is what makes it art- if you get my meaning?
Personally I find a woman´s shoulders to be particularly beautiful. Therefore if a woman wears one of those "off the shoulder dresses" (not sure if they have a name) then I find that image stunning. I have no idea why, but I don´t think we need to understand everything in life. Thanks for your artwork. Upvoted and followed.