Inspired by the recent  Sky Competition – May 2020 which  for various reasons I was  unable to submit any entries, I decided to check all my images where the sky was the main subject or an important part of the image.
I recovered the original raw files and reprocessed them with concentration on the sky.  the raws  were re processed  with Qimage with concentration on the sky which mainly involved reducing the Blue and cyan to make the clouds more prominent.  The blue sky areas were excluded from sharpening to reduce sharpening of any noise or chromatic aberrations.

    
I noticed in the competition there was some comments about lack of cloud sharpening.  I have found many clouds (eg lenticular clouds) do not have enough edge factor to take sharpening well, increase the sharpen factor over sharpens other areas and any noise, you take you choice, at least I do and say sod it.  

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The original raw files could not be found in a few cases, so jpegs have been recovered from various sources.

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A Click on image opens up full screen, Esc or top left/right arrows opens up the image with title and comments. 

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These pictures were taken by the Jeff Milan on a recent visit to the Guggenheim Museum, Bilbao.   He gave up trying to straighten the verticles.