Some of the comments may be useful for beginners. Others are useless or plain stupid, i.e. :
I don't like this genre, foreground is out of focus, great idea, interesting concept, nice colors, colors good, more or less foreground would help, like composition, like diagonal, nicely handled, try it again, person in center good, remove jet trails (in the sky), more dynamic image would score higher, etc.
But on the other hand, these people put in a lot of their free time, and they do it for free. And sometimes it makes for good entertainment.