If the curtains are just blue, I don't think there's anything more to say about it. It seems obvious from the details I put in my initial comment, but if you just shrug at that then I can't really say more, any more than I can persuade a libertarian that empathy is cool and good. Perhaps someone more patient or motivated could pick apart "What makes you say that they are all attractive? What do you suppose the significance of the only five characters all being attractive women is?" etc. but who cares? Honestly the thing that pisses me off isn't the picture itself but some people (not necessarily you) being so fucking obtuse about it. Just admit that they are little national waifus and move on! (again, not necessarily you)

I find the sensibilities of the artist gross, but she's not someone I actually know and there are thousands of grosser artists on twitter and hundreds of thousands elsewhere, so it's not like I'm particularly offended by it.