[toni-a]

Try a ND or gradation filter instead of using f/20 and decide what's important: clouds or sea. At the moment I feel you leave the decision to the one looking at your picture and all I can say: I see not enough of both and too much of both. Make up your mind.

Will retake the shot using my polarizer as ND since I don't have one, anyway will retake the same picture several times with different setting to see how it turns out.

do you think a lower eye level  would it help here ? knowing a lower eye level means jumping down the fence and risking getting wet since we often have waves there 

this is another view taken from the same place (not taken by me)