C&C per req:
1. Awkward lighting; her face and chest are in shadow, and there are bright/blown areas behind her. Using a diffused flash on low power would have really improved this shot. The colour/treatment is not one that I find flattering for a child. Watch your backgrounds; the bars/vertical lines are a bit distracting.
2. Pretty much as per #1; be careful in your composition and avoid cropping little bits of limbs such as her fingers. It's fine to crop limbs if you need to, but always do it boldly and never at/near/through a joint and never laterally.
3. Good expression but the eyes look a little over-processed and you HAVE to get the flash off of the camera!
4. A very awkward crop and your DoF is way too shallow; you want both eyes sharply focused, bu her left eye is almost focused, and her right eye is very soft.
Overall, they're not a bad set, but I would suggest some more work with the flash, and learning how to work with it off and on camera. To start, read up on bouncing and diffusing flash, then move to off-camera flash work.
Just my $00.02 worth - your mileage may vary.
~John
