I'm gonna have to agree that these are pretty sick. I'll also go a little further and say that the 12 year old ones are over the line as well, to me. The only reason they don't look appalling is because of the 7 yr old ones. But if I forget those for a moment, and just think about the fact that there is a 12 yr old try to look sexy, that is also creepy to me. But since that's not why you posted them, I'll go another step further and say that regardless of creepiness, I don't find them to be anything special. They all have elements that could be improved. They all pretty much look like direct sunlight pictures, and the light isn't very soft or flattering, and the shadows are mostly hard and distracting. The bricks look fake for some reason. I hd to stare at a few pictures to decide if they were real or not.
#1 - her head is perfectly level and her smile is flat and looks forced. Her head should be tilted. and there is a black thing sticking in the left side of the frame.
#2 - seems kind of overexposed. the ground is pretty dirty. her hair is too much in her eyes.
#3 - hair in eyes. otherwise pretty good. Really good expression.
#4 - Despite the fact that the girl seem to think this is a good model pose, it's not really. Backs of hands are generally a no no and are pretty unattractive in this and most cases. the white shirt and black vest are both clipped. the up the skirt pose is just revolting, sorry.
#5 - The pose is realy stiff, her legs are locked out, and her butt is sticking out in a way that makes it look big. her hair is all over the place. the background is a disaster.
#6 - same thing here, what's up with the background? half a bucket on the right edge, a trash can behing her head. It looks like you both forgot she was wearing a scarf and it just kind of ended up in the picture on accident. do they not own shoes or something?
#7 - This would be the best shot of the group is her hand wasn't cut off by that door. The plywood and the edge of the wall running out on the left are distracting. Should have backed up and cropped tighter with a longer focal length.
#8 - the one you posted up later is really crowded and busy in the background, and it looks like you keylighted her with on camera flash. The light is really harsh.
Seems like the whole shoot could have been improved by shooting at a later time.