Very nice framing with a lot of "areas" to explore visually. I agree that the sky blue is a bit deep, but what is more distracting to me is the vignette. Whether added or occurring due to the lens/aperture, my opinion would be to remove it. I personally prefer to use vignette to draw attention to a somewhat centered subject, but with a landscape like this, I'd want the viewer to explore the image corner to corner and edge to edge. The vignette sort of fights that to my eyes, as the very center of this image is the least interesting part for me.