Good sense of speed. Although A bit of land showing would make this look great. The clouds don't seemed to be deatiled.  Just do those things and the shot will look much better.

Try to think of your screenshots, particularly the ones you take time to set up, as words in a book. I think screenshots, as well as photographs have to read just like a good article in a magazine or story in a book. They have to make the viewer understand what's going on and provoke a personal opinion about the subject matter. If it doesn't, then an alternative way to create impressive screenshots may to add some shock value. A really unique perspective, a rarely used and ultra agressive zoom, colors that are original and curious to look at. Work on developing your own unique style in all your shots (remember Lemoncat?). Might be the type of aircraft you use, or your use of clouds..something that consistantly seperates you from everyone else. People should almost always be able to look at your screens and know they're yours without seeing your name attached to it. Not an easy task, but if accomplished, your profile as a screenartist will shine brightly.
  This effort is getting there, in the fact that you're trying to create a specific feel and sense in your pic, unfortunately it's a layout that has been used really often. Look at the Gallery entries, try to determine what makes those pics appealing. Use some of the techniques and visuals you see there. Don't copy them, just pull the elements in them you like and create your own scenarios. Hope this helps...