Fun composition in these.
As for #1, harsh light and shadow is kind of distracting. Maybe someone could have held something up to block the sun?
#2 I like it a lot. Don't you hate power lines though? That background would be perfect without those. Could you photoshop them out?
#3 is my favorite. Great job.
#4 Very good too. It would probably be a little better with all of her knee in the picture though.
The last one has a fun idea, but could use some tweaking. I wonder what it would look like if you cropped out the top of the picture with the fence, kind of distracting.
Great job on these. Keep it up!