It's late and I feel like posting the results to a bit of digging I was doing for a while.
Rokuro Saito said she wanted people to understand the metaphor behind this picture but what interested me was when she said the art was "inspired by symbols and allegories in Western paintings" because I really wanted to know what this meant. The flower and the "non-human being" appearing in a dream like state was inspired by Japanese folklore. So the only thing that could be inspired by western paintings had to be the pose and the positioning. So I finally found out what this is called, it's a pose called A-Framing that became very popular in the 1960s in the west and it started because of the movie poster for the Bond film 'For Your Eyes Only'.
The A-Frame was used before this obviously but sparingly. I can't find many old paintings that use it and one source I looked up said it was used in 19th century engravings but I've yet to find these images so I don't think she was going that obscure with it.
In comic books, the A-Frame is used to set up a mystery character as a tease for what the issue is about which could be part of the intention here but this is usually set up as like a showdown. Action movie posters also do this with the hero and the antagonist which is obviously not what we have here. But typically when the subject is laying down between the legs it's almost always for sex appeal. The subject towering about is supposed to show sexual dominance and the subject below being dominated. This is pretty much always the case in every movie poster I've seen with similar poses.
So after my research, I think the only thing I can come up with in regards to her comment about "Western paintings" is that she was looking up western movie posters with sexy A-Framing. The end of my search kind of feels like opening a "dead dove do not eat" paper bag. I don't know what else I expected. But if you want to read this article, go ahead:
https://www.bygonely.com/the-a-frame-design/
