Here's a stark realization about how Disney draws their princess characters out: they make their eyes bigger than their stomachs! So how realistic is this? How about not-at-all! Here's seeing the differences between eyes and stomachs of each character:
Elsa from Frozen
Anna from Frozen
Rapunzel from Tangled
Tiana from The Princess and the Frog
Ariel from The Little Mermaid
Jasmine from Aladdin
Belle from Beauty and the Beast
Pocahontas from Pocahontas
Aurora from Sleeping Beauty
Mulan from Mulan
Meg from Hercules