Very pretty color here. It definately does meet the challenge. The problem I see with it is just to much negative space. You needed to crop in closer on the plane and also use the rule of thirds it will help greatly. Try to put your subject in the outter 1/3 instead of dead center. It will increase interest.
Nice colors, pretty sky. I see your airplane clearly enough and get the sense of flight, but interest level (wow factor) is low. Nice silhouette, leaving little detail of the subject. 6 Rob the Swash
I wonder why you chose to place the plane in the centre of the frame? This is usually not a good place to put your subject, and I really don't think it works here. If it was on the right, it would make sense as the negative space would exist compositionally for it to fly into. The clouds don't seem to work as a compositional device either, and look accidental here. For a stronger shot, an additional element is needed, such as an interesting cloud formation, sunset, or foreground element. 5