C&C per req:
1. Good expression, but the fill light/flash is a little too strong. Also be congizant of distracting elements; the house, and orange-coloured objects image left.
2. Very good, again, the table in the background is a distractor. Both this and #1 are a little too centered; try and follow the 'rule' of thirds for these types of images.
3. Very good. Background isn't really an issue in this one, exposure is good, and being centered works given how close you are to the subject.
4. Cute, but I think a closer crop on the subject.
5. Excellent, however there appears to be some flare, possibly as a result of shooting too near the sun? Did you have a lens hood?
6. Almost, but not quite. What would have made this a great capture (the background notwithstanding) would have been to attract her attention, so that she was looking toward the camera; not directly down the lens, but just toward you enough so that you could see a little of her face.
Overall, very nicely done.
Just my $00.02 worth - your milage may vary.
~John