Hi Doug,
Those shots are quite nice, I must say I really like the colors in them. My favorite is the third one, it has a good background scenery with pleasant colors.
Overall, I think you should vary the camera distance a bit more (you know, with CTRL + '+' and CTRL + ' -'). The angle of view aren't bad though, but the first shot, for example, would have been better if the plane was closer, or not in the center of the picture. Same goes with the last shot: since there's nothing to show behing the aircraft, show the aircraft

Now, just to be clear, I am not saying to shoot all of your screenshots from closer to the plane. Distant shots are cool too ! But in a serie of screens, it's nice to have variation.