I think it would look more put together if you kept the two different themes separate.
Like maybe make all characters Disney princess ( Snow White , Belle, Cinderella, Sleeping beauty) and only decorate their houses Disney princess styles reflecting them.
Or go with Minnie, Mickey, and perhaps Daisy, Pluto, Goofy, etc.
Some item ideas:
Minnie: Celeste hair bow with black hair
Daisy: Beak
Cinderella: carriage
Belle: single rose
Sleeping Beauty: spinning wheel , fairy in a bottle
Snow White: garden gnome, rotten apple, desk mirror