I think

They all tend to get the level of attention I think they deserve, if not more, but I'd say Mulan, Snow White, Rapunzel or Tiana are closest to being underrated.

She's way more beautiful than people say

Mulan's beauty is picking up. Lots of people notice it more. but everyone condemns dear Snow because she's got a prepubescent figure, short curly hair and a small nose. She doesn't deserve the hate. She beautiful, without sex appeal too boot.

or Tia. Both are really pretty.

And Tiana because people think her hair is ugly. I think it's pretty if not so beautiful that others but she shouldn't be hated because of that.
I hate that everybody seems to say that Mulan has weird lips and her eyes are not so special. In all the prettiest lips countdown what I have seen Mulan lips are from that scene where them are "weird boomerang shape" and because of that she is always low. There are so many scenes where her lips are beautiful. And I love her eyes, them are pretty.

And Tiana, but recently, I think people take more notice of Tiana's beauty.

I think Snow White is really pretty.

I think Tiana and Mulan are beautiful- not gorgeous but beautiful. But I don' thtink Snow White isn't beautiful becaue of her hair or nose of shortness. It's her skin (it's like she deathly sick!!!), her eyes (they totally ruined the eyelashes), and...that's it. Other than that she's kinda cute...

Also Mulan and Rapunzel. I think all three are so breath taking.

Also Rapunzel

Mulan, Snow white and Rapunzel, definitely