I'd lighten the faces a bit. Leave the girl with the chin partly cut of in the photo. When shooting model photography, some parts of the body is purposely done like this. (I was asked to do it when I shot a 300 image portfolio for a model--though it's usually not a chin.
I've also read that when one side of the picture is cropped very close (chin-girl) that if you also crop the other side extremely close (say to the ear of the girl on the right, this improves the image. If you notice, the girl in back of the chin-girl also has her chin partially cut.
Yet, I know the parents, etc. probably want to see the chin, so I've also been know to actually widen the picture on that side, crop a bit off the other side and try to reconstruct the lost part of the face, ear etc. I've had good luck with many animals (for clients) and even things like feet, ears, arms, etc. on humans. It isn't easy, but something to play with if you've been working for years in Photoshop.