These two, in my opinion, are quite a few steps above all the others.
I really love the first one infact, but the hair (And scrunchy-tie thing on the first) on all of them looks majorly WIP despite the details.
All of them but the first need to take form into account more, and the colors of the pink girl's skin are way too washed out
The second one, the orange-haired girl, looks like the direction of the face is trying to point in two directions at once.
Attorney's not bad but I think you should rely less on black outlines for your detailing (goes for the elder, too).
The indent on the chin of the first one could be less prominent, too.