I'm not sure the composition works for me here. My first reaction is that there is way too much sky perhaps a square crop would take care of this perceived issue, losing also a bit of the water in the process for a balanced frame.
The other thing that bothers me a bit is the blown-out and shapeless sun a shorter exposure might've prevented this from happening. Per the EXIF data on your Flickr, this is a 39-second exposure at 70 mm even at that focal length, with such a long exposure you're bound to capture some unwanted movement of the sun, resulting in a sun that's not round (and in this case also blown out).
I agree with Doug in that I would've liked to see some detail on the rock, or otherwise just the outline of it it seems underexposed as is.
Just my two cents.