I always appreciated the quality of literature not to exactly prescribe you how somebody looks. But we probably assign a certain appearance to the characters anyways.
So... I kinda picture Elyse as a stuffed-bra, more make-up wearing and more self-esteem having version of Daria.
Molly... That little girl from "Poltergeist"? Nah, sorry... no clue. Especially since I don't remember all the names of the temporary teeny sweethearts of Hollywood.