It like it a lot! My only suggestions would be to go back when there is a more interesting sky and I find the vignette to be distracting, maybe make in no so noticeable.
If it was then I understand that it is part of the camera and therefore a part of the picture...but it did not look like it to me
I feel my personal dislike of heavy vignetting supported by this photo ... it is too much here (for my liking) once again. Do tell us what you worked with when you took this photo, will you, Mike?