I got my Audubon magazine, which features this issue the photo contest winners. The aesthetic is gaudy and virtuosic. After all, to win a contest an ordinary photo of an ordinary bird will not do. A high speed exposure that captures an unusual movement, or some other unusual or stunning view. It is not my aesthetic at all, but I am thinking that you couldn't have a contest without rewarding pictures of extraordinary technical proficiency that are also striking to the eye. This is the only aesthetic that any contest of this type could possibly have.