Ravenclaw is for smarty-pants and the occasional smart-ass.
Obviously Belle, cause she's a nerd, as well as Jane (bottom left) for her education and wildlife studies. Tiana is hard-working, yes, but also real smart with her choices/money/organization. I put Esmeralda here (bottom right) because she doesn't jump right into the fray ALL the time. She knows when to hide and how to handle herself, and has a real smart brain for debate and politics (her smack-down with Frollo in the courtyard, biatch!)
Tiana's boots rock. And this doll maker doesn't have EVERY choice of hair or outfit . . . AND no bronze colors, so pretend all the browns are bronze. Or whatever.
Disagree on Esmeralda and Tiana but I'm with you on the other two. I think Esmeralda fits more into Gryffindor, and Tiana works too hard to be anything but a Hufflepuff. You could just see her "So, where do you find the hard workers?" Hat :"Hufflepuff." Tiana "That's where I'm going then." Belle is not a nerd, but she loves books too much to be elsewhere. Jane IS a nerd, and loves studying to much to be elsewhere.