You only have 9 posts, so I would think it would be easy for you to see if you have posted before....
But since you are new to the forum, I will be happy to help C&C:
1.) I like the concept, but the flower is to over-exposed.
2.) Horrible picture. Not sure if you were just trying to capture the rainbow, or the girl on the right. The horizon is tilted, and the girl is cut off.
3.) Good capture. Next time think of all of the elements in the photo. The flower at the bottom is distracting from the entire image.
4.) Great capture. I love the concept. It really makes me wonder what he is looking away at.
5.) Your camera focussed on the water, and not the kids. Maybe that was your intent, but my eyes want to go to the children, which are out of focus.
6.) If you were trying to "stop" the water/action, you did a good job. The composition could be improved. The dirt in the upper left doesn't add anything to the image. The child is under-exposed in the shadow. This is where a fill flash would have helped (but would have been impossible to sync at 1/800th. Next time maybe try meetering off of the shadow and using that for your exposure information.
7.) To much going on in the picture. Busy background, not sure what the subject is. If you were just trying to "freeze" the water, you succeeded, but it is just a snapshot. Try to think of all of the elements in the photo before you make the capture.
Overall, keep at it and keep shooting. Soon you will be taking great photos. This forum is a great tool to use to learn.