Why did you let her wear black and shot in a black background? That's what I always try to avoid. But I do admit the light make the black clothes stand out and desperate from the background in some way.
The first one is cracking, specially with how she placed her feet. I like the black on black, it sets such a different mood that we usually don't see for kids pictures.
As mentioned above, I'd like to see one pull her sunglasses down her nose a bit to show her eyes with her hand still on the glasses, kind of an "attitude you looking at me" picture.