1. Eh...not feeling it. The tree just isn't an interesting focus point.
2. There doesn't seem to be any obvious point of focus.
3. Too centered. Also, try using "shade" white balance to warm up the tones.
4. Getting better. I'd have framed her a little more to the left to have a bit of space on the right and also used fill flash as she is a bit dark in the scene.
5. It's alright, good focus and depth of field.
6. Some interesting geometry here, but I'd like to see it less centered.
7. This is the strongest one of the bunch. Nice gesture, good focus, well isolated from the background, which is nicely blurred.
8. Interesting, not sure about this one.