Only thing i would do here is clone out that small dark blue patch of water in the lower left of the image. otherwise I like how you balanced the many elements in the image. Good use of layering (water, birds, land, mountain, clouds and sky) to provide many horizontal layers in the image thereby adding depth and a flow into the background.

For me the birds are not necessarily the main focus of the image, just one of the many elements that contribute to the whole.

The rule of thirds is well demonstrated here by the clear “zones” in this image… the clouds, the mountains, the swans. I guess that’s my “technical” explanation. Artistically, it just works. Nice job!

thanks
Charles