I think it just would've meant that they'd be attractive and not just the stereotype villains that evil people are ugly and that there are no beautiful evil people.

It wouldn't have changed their personality. Lady Tremaine actually isn't ugly she's just older. Drizella and Anastasia aren't very pretty, but they aren't hideous.

^ What s/he said.

They're already super-beautiful, IMO. But no, because there was a lot of gorgeous girls at the ball, yet Charming wasn't interested in them. He would still fall for the unknown girl in the shimmering dress, looking confused to her surroundings.

I feel as if Charming would've just fallen in love with either of the sisters

They really aren't ugly, just plainer compared to Cinderella. And who wouldn't look plain standing next to Cinderella,

I don't think so.

What prussiaducky said. And also, Cinderella would probably have been allowed to go to the ball.

I agree with prussiaducky. That would've been an amazing plot twist!

What Silverrose1991 said.