2, 3 and 4 I like a bunch, even though #4 is a little too soft. What happened there, because I like the expressions on the girls faces?
If #2 is touched up, I would have like to see the original. But thats me. Im of the opinion that most people on here over edit.
In #1, the color is way off, at least on my monitor. Im not crazy about the girls mouth, either. Thats the only toss for me.
Meanwhile, I think you can start charging and practice your lighting technique as you go. You seem to have a great rapport with the kids, and that's the main thing.