Nice shot... but always look out for things that can differentiate your take from others.
My 2 cents: Would have been better if you actually got the chance to capture the sun rays bursting out of the clouds. And if ever the sea was calmer, it would have gotten a nice reflection of the sun's rays
Try to have a distinct subject in the picture, something that can define the foreground a little more. You could also try to compose it such that less of the foreground can be seen, since the sky's your main focus here.
Good try for a first attempt. Dramatic skies and clouds like this are really hard to come by.