Snow White and The Seven Dwarfs: Snow White
Cinderella: Cinderella
Sleeping Beauty: Aurora, Queen Leah, and Maleficent are all plainly pretty at best and are pretty much equally plain
The Little Mermaid: Ariel
Beauty and The Beast: Babette(the bimbettes are prettier than Belle too)
Aladdin: Jasmine
Pocahontas: Pocahontas
Mulan: Mulan
The Princess and The Frog: Tiana
Tangled: Rapunzel
Brave: Elinor

Snow White And The Seven Dwarfs - Snow White
Cinderella - Cinderella
Sleeping Beauty - Aurora
Beauty And The Beast - Belle
The Little Mermaid - Aquata
Aladdin - Jasmine
Pocahontas - Pocahontas
Mulan - Mulan
The Princess And The Frog - Tiana
Tangled - Rapunzel
Brave - Queen Elinor

Snow White and The Seven Dwarfs: The Evil Queen
Cinderella: Cinderella
Sleeping Beauty: Aurora
The Little Mermaid: Aquata (actually all of Ariel's sisters are prettier than her, she's just cute)
Beauty and The Beast: Belle
Aladdin: Jasmine
Pocahontas: Pocahontas
Mulan: Mulan
The Princess and The Frog: Tiana
Tangled: The Queen
Brave: Merida

I'd like to picked all of them but then I realized that we have Merida now... So Queen Elinor prettier than Merida.

Snow White and The Seven Dwarfs: Snow White
Cinderella: there's no pretty female character
Sleeping Beauty: Aurora
The Little Mermaid: Vanessa
Beauty and The Beast: Babette
Aladdin: Jasmine
Pocahontas: Pocahontas
Mulan: Mulan
The Princess and The Frog: Tiana
Tangled: Rapunzel
Brave: Merida

Between the Queen and Snow White, Snow White wins hands down.
Cinderella and her ugly sisters - no competition
Sleeping Beauty: Please, Aurora is the most beautiful animated character of all movies, if you ask me.
TLM: Nope, Ariel looks better than Vanessa
Batb: Belle has some really strong completion...I think she has the most character overall, so I would pick her.
Aladdin: Harem dancer aside, there is no other female character aside from Jasmine.
Pocahontas: I think Nacoma looks better - more natural, and I like her smile better.
Mulan: Well the matchmaker....just kidding, Mulan is the most beautiful.
TPatF: It's hard to compare Tiana with Lottie, they are both beautiful, but in an entirely different way...Tiana might have a slight edge.
Rapunzel: I think that she and her mother are equally good looking...each for their age.
Brave: Merida (not that there is a lot of competition for her)

All but Brave (Merida) and maybe Princess and the Frog (Charlotte).

Snow White and the seven dwarfs: Snow White
Cinderella: Cinderella
Sleeping beauty: aurora
Little mermaid: Ariel
beauty and the beast: belle
Aladdin: jasmine
Pocahontas: Pocahontas
Mulan: Mulan
Princess and the frog: Tiana
Tangled: tie between Rapunzel and her mom
Brave: Elinor

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in Tangled, Rapunzel's mom.

Snow White and The Seven Dwarfs: Snow White
Cinderella: Cinderella
Sleeping Beauty: Aurora
The Little Mermaid: Ariel
Beauty and The Beast: Belle
Aladdin: Jasmine
Pocahontas: Pocahontas
Mulan: Mulan
The Princess and The Frog: Tiana
Tangled: Rapunzel
Brave: Elinor

Snow White and The Seven Dwarfs: Snow White
Cinderella: Cinderella
Sleeping Beauty: Aurora
The Little Mermaid: Ariel
Beauty and The Beast: Belle
Aladdin: Jasmine
Pocahontas: Pocahontas
Mulan: Mulan
The Princess and The Frog: Tiana

Tangled: Rapunzel and her mom equally beautiful
Brave: Elinor, slightyl more beautiful than Merida

Snow White and the Seven Dwarfs: Evil Queen (but it's almost a tie)
Cinderella: Cinderella
Sleeping Beauty: Aurora
The Little Mermaid: Ursula (JK, Vanessa)
Beauty and the Beast: Belle or Babette; I can't figure out which
Aladdin: Jasmine
Pocahontas: Pocahontas
Mulan: Mulan
The Princess and the Frog: Tiana
Tangled: Rapunzel's Mother
Brave: Queen Elinor

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Alright, so I'm including extras as well.
Snow White, Ariel, Jasmine (obviously,) Pocahontas (she is the most beautiful princess,) Mulan, and Tiana.
I can't decide on Cinderella (there were some very pretty women -from what we got to see of them- at the ball,) Belle (I personally don't think Babette is all that attractive, but I think the townsgirl who said "good day" is very pretty,) and Rapunzel (her mother is very beautiful as well.)
I personally find Leah more beautiful than Aurora, she looks more mature and sophisticated to me, as well as more subtle and refined.
Merida would be the most beautiful in her movie except for the fact that her animators decided to give her a horrible face shape, all her individual features are beautiful (well, her hair can also sort of overwhelm her face,) but because of that, Elinor is more beautiful.

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Exceptions are:
Pocahontas - Nakoma
Tangled - The Queen
Brave - Elinor

8: Cinderella, Aurora, Ariel, Belle, Pocahontas, Mulan, Tiana, Rapunzel :)

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Snow White and The Seven Dwarfs: The Queen
Cinderella: Cinderella
Sleeping Beauty: Aurora
The Little Mermaid: I think Ariel is much prettier than Vanessa.
Beauty and The Beast: Babette is slightly more interesting look wise than Belle
Aladdin: Jasmine
Pocahontas: Pocahontas
Mulan: Mulan
The Princess and The Frog: Tiana, but Charlotte is not far behind.
Tangled: Rapunzel's mom
Brave: Elinor