grayhaze....a fact of sexual attraction revolves around male perception of potential fertility of the female image...specifically hip to waist proportion and proportional representation of facial features...the younger-looking the better.  This is animal dynamics and well proven and researched.
The anime and/or hentai stylized image is a direct correlation of this attraction targeting....all to do with the 'ideal' proportions of facial characteristics deemed the popular attractant.
Do an analysis of the 'traditional' female 'beauty' and compare.
Who is claimed to be the world's most 'beautiful' actress?.....Audrey Hepburn....she have large eyes for her face proportion? ...sure does.
There's nothing magical or obscure about the motivation behind the anime artist's styling choice.....just pure physics of biology.
This big-eyed, young faced, well endowed 'creation' is not easily dismissed as being a fault of the beholder...it is marketing-specific, with one intent...to titillate the predatory sex [male].
Only a small part of it can be excused as the Japanese predilection towards western features  [eyes less-heavily lidded], the real issue is with a dissimilar social response to sexuality being depicted in the young.
Do a search on 'hentai' and you get a clearer idea of where it all goes a bit 'wrong'....