Neat subject and nice colors of the sky. There appears to be a lot of digital 'noise' around the subjects. I am also seeing interpolated pixels (square blocks) in the upper right. This typically indicates the use of digital zoom or post processing pushed too far.
Not sharp enough for my liking, and a bit too small to really enjoy. It is a great opposites image though, and as a plane buff I find it has interest to me on that level as well.
While I think the concept is certainly solid, the color pallette is a bit too flat for my taste (stronger saturation, maybe?), and I also feel that this is one of those rare instances that I would want to see some motion blur on the subjects, just to get across the fact that they really aren't just hanging models. That's a personal choice though.
Really try to use the whole 640 pixel width range they give you...it's hard to make out details on the small photo. Good concept and capture; wish I could see it better.
pic is a bit small, noisy and not sharp. neat shot though. i see definite jpeg artifacts inteh upper right corner of the sky - check the forums on resizing and compression for htese challenge entries and perhaps check you software for other options.
less than 4K. The limit is 150K. I realize this was probably a crop of a much larger image, but it was still compressed way too much (JPEG compression), especially if this was the highest quality setting on your camera (which i hope is not the case)