I'm making an AUTHENTIC princess dress for my little cousin. HELP!!!! I need ideas!!!!!

I am currently not a member of this club but I was hoping that آپ all could help.

What do آپ think is the prettiest princess dress? My little cousin likes the really puffy dresses, the color blue, and she currently got a Little Mermaid Vanity for Christmas. But her پسندیدہ are Anastasia, (and totally unrelated) TinkerBell. I know that technically they are all similar but which do آپ think would look prettiest on a cute, little, short, three-year-old girl.

Honestly, I think Ariel's گلابی dress is the prettiest, but I could make it blue. Also since it is still winter I am also planning to make her a cute little cloak.