Composition: Generally most images can break the rule of thirds without causing to much imbalance but I feel this one has too much sky and tends to drage the viewers eye up into the vacant area. The fence diagonal is good as it takes the viewer up along the fence to the people, then to the glider and then....nothing. Can you see where you get a little bit lost in the sky?
Technical: I hope you don't mind but I worked on this image to help you understand what I am talking about. For starters, this image needed some contrast. So I increased the Brightness/Contrast followed by a shift in the Hue & Saturation. A touch of levels and you will see the result below. I would like to note that I was pleased to see the control of tones wihtout any blowouts in the image.
Overall: I think this image has promise but needed a little more thought to the composition and processing.