To me the picture is unbalanced. However, it looks as if you have avoided the foreground on purpose and concentrated on the sky. i believe that the building should occupy more of the image (height wise). Even if there was something unattractive below the bottom edge the placement of the church cross at the top of the image should make a more pleasing picture

Thanks for your comments, Dave. As we all know, there are as many points of view as photographers!. There was a beach beneath the church, wit people in it. Should I have included it (one of the people and some rocks do appear, anyway) the image would have been more 'in scale', it would be easier to grasp the size of everything. But the subjec of the image was (for me) the opposition human/nature, solid/aetherial, building/cloud. I supressed the beach intentionally, and have even thought of supressing even the rocks and waves on bottom, to stress the atemporality of the scene. To me the most important part are the cluods, the diagonal composition of the main cloud with the church, and the relation of it with the horizontal line of the sea (a bit tilted, unfortunately). Possible the sky should be more contrasted (Using a polarizing filter?)

Nice picture

Thank you, Adolfo (?Gracias!)