A kids physics experiment. The rocket is filled with water and pumped with air while being held down, it is than released and the air pushes the water out and propels the rocket up.
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You had a good subject, but I have some ideas to transform your image in a better one:
1 - The colors are saturated. You can fix this with an image editor.
2 - The theme may be in the center of the image. It is not.
3 - You could placed your camera in a lower position. You could see the rocket from the botton. So the image would have a more dynamic view.
4 - You could shot this photo a little more far away from the subject. This will change the image in a more didatic one ( easy to undestand ).
Very cool water rocket! Photo leaves a lot to be desired, I'm afraid. Seems excessively grainy and soft looking. Not sure if there is much you could have done with it or not, though some noise reduction would certainly have helped.