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Red skies at night, a sailor's delight.... Red skies in morning, sailor take warning... At least when crossing the Atlantic from Europe to the Americas..
Good example of how to crop when the sky is the star of the show, but within the sky the star is (quite literally) the sun. That's where attention gets pulled by contrast wherever my eye enters (top/bottom/left/right) which makes the composition feel more static than when placed off center. The vertical rather than horizontal crop also makes it feel static and "cramped".
That said I've also taken sun shots (usually sunsets on Panama City Beach, FL) with vertical crops where the sun wound up in the center, but it was dictated framing the interesting foreground content. Yours is a nice dramatic sky shot, but when you can also get more interesting action with people in the foreground it makes, I think, for a more interesting photo and story imagined from the POV of the people seen in the shot. Here are some examples of mine of what I'm suggesting....
There the vertical crop was dictated by the angle of the beach and the position of the sun on it's reflection working a leading line at an equal opposite angle creating an X pattern right where the person bending over is looking...
With these I had walked down to the beach to see the light show with a P&S in my pocket, and caught this sequence in landscape mode....
Then seeing this couple near the water I ran down behind them and grabbed this one...
I'll only use portrait mode for a landscape/skyscape if the foreground action dictates the need. Was there something you had to crop out of your shoot than made you opt for vertical?