Most realistic body image??
As we know, every "Disney Princess" seems to have a very similar body image... apart from Merida, who is Pixar, and her image was made to prove a point. I mean, when she was added to the Princess line-up, they did change her image to appear more slender, and her face was more wide and round than her actual look... this angered some fans, and even the co-director herself, Brenda Chapman, so her image was changed back.
When you look at Moana, she does look like Rapunzel, with a different skin color (of course) and different hair-style. But, she does appear more "thicker" with the arms and legs... but, to me, that's actually more realistic than the former...
Not to discredit the animators, but Rapunzel, Anna and Elsa look kinda anorexic compared to Moana. I mean, do yourself a favor and observe the image gallery for 'Frozen Fever' (2015), take a look at the still image where it's a painting of Kristoff, Anna, Elsa and Olaf sat on Sven and smiling. Kristoff's one arm looks chunkier than both of Elsa's legs!
I don't know if Disney will continue this look in their future films... but at least it's good to see that they know how a 16 year old should appear.