I like your idea, well thought out, nicely executed too
But i have concern regarding your this line of the comment:
I also like high key shot but they as you said, usually work in portraiture where the nearly all the focus should be on the person. But in Nature shots, this doesnt work for me. You have captured a natures scenery and it would be a shame to remove the clouds from it. It does give a clean look, but the blank, bright white space doesnt hold any interest to me. A bit bluish clear sky, few clouds would have worked well.
I will also ask you to upload the original shot, and then we can compare that whether the clouds go with the image, or have to go out of the image