4000th sec is very very fast, obviously you're dumping potential light by doing that , unless the spot was very windy,, but even then , you could've closed your aperture a bit more to reduce potential color fringe-(which would increase sharpness for black and white).. or you could've slowed way down and let the clouds smudge to show a dreamy sky if you have a tripod ,Or use the polarized filter to increase contrast in the sky , Or even use a colored filter to change the look of the rocks. ( which changes things for black and white rendered shots too , right ?) Since you have so much light available , you have plenty to play with. IMO , but it probably looks pretty good as it is (full scale). But to a degree it depends on what is the sharpest aperture for your lens is at that focal length.