They all have different types of pretty -
Olivia is Model pretty - she has that heroin chic / editorial look about her, big blue eyes, dark hair, plump lips thanks to filler, looks tall because she has long spindly legs, doesn't really have dress sense so just copy's others or gets people to dress her.
Ruby gives girl next door pretty - she's got mousey brown bouncy hair, petite but doesn't look sickly, unique features, interesting dress sense. She's very NYC to me with how relaxed her personality is / how she dresses.
Flossie is private school pretty - she's got a very british / descendent of an aristocrat look to her lol like you'd see her in a painting in a state home. Natural dark brown hair, petite, dresses some what time less with her outfit silhouettes especially when dressing up.