There is some interesting banding throughout the image. Is there something up with your sensor? It looks like it might be a photo of an image on a screen.
Really cool! The boom, on the vertical plane seems flat against the sky which obviously is not. But it does seem to force the sky into the vertical plane, you know, flatten it out.
I love this! The high contrast is perfect. But there are some many middle tones in the sand. The middle tones in the distance are perfect. I find the vignetting to be distracting.