OK, you asked for it.

This shot really is nothing special. It's generic, and actually looks cliche. That particular angle has been used quite a bit, and the plane is a little too far away, and  for a military aircraft, there is nothing exciting going on in this photo.

Your too high, descend.

There are clouds in the background, but none in the foreground. This makes the shot look rather 2 dimensional, and takes away from the excitement in the photo.

Quality control is good, no problems with jaggies or compression.

You are too far away from the scenery, in fact, there is hardly any at all. Good mountains make good shots and add a third dimension to the picture, and you can never run out of good mountains. Flat plains are never looked that great.

That's all I can find.

Hope this helps. Remember:

Fly in the scenery, not above it.
Fly inside the clouds, or close to them.
Find an angle that shows off both the plane and the scenery.
Have the plane doing something exciting.

These are the keys to making any shot look good. I look foward to seeing your future endeavours.

It's a nice scene, but JR's points are very valid. For me, the plane is too small. If it were nice and big, and looked good, then it wouldn't matter so much about the scenery. Don't be afraid of shooting pics over flat land - but the textures had better be good - and water helps, as you've used. The basic rule of thirds from photography might help - half land, half sky doesn't look so good - having 1 third land and 2 thirds sky is better, or the opposite, depending on what looks better....

Jet Ranger, thats a great evaluation!   Not much more to add except this..
Notice the vertical lines through the water. As you probably know, these lines appear, dis-appear continually as the water effect works. If you take a few shots trying to time the shot when these lines aren't visible, it'll make for  much better looking water.