About the Image(s)

I choose to share this picture taken in 2016 on my 1 st trip in Iceland.
I have never been satisfied with my post processing. The color of the sky seems too dark on the top of the mountain. Something seems wrong/ unnatural in this capture.
When I took this picture I was using a tripod and a circular Neutral Density filter on my wide lens. I wanted to smooth the water. I was novice using this filter and felt I didn’t use it right.
I processed this picture using only LrC, using masks ( sky, brushes and luminance range)
I hope our group is going to be interested in improving this picture . Thank you all in advance .

Camera settings:
Canon EOS 5D Mark III -Lens Canon 16-35mm- ISO 200 F/14 1.3 sec - 22mm- Tripod and circular Neutral density filter