Hi, the photos are very well taken..
But there seems to be something missing in each, if you get what I mean.. It's just sun, sky and sea. While such shots can really work, the sun, sky and sea must be really dramatic enough in order for this to happen. As far as I can see, only this is met in the fourth one, which I really like - the way the waves are moving, the graduation of tones in the sky in the distance.. The interesting clouds.. They work! =)
#1 is quite good too, I just don't like #2 and #3. Nice work though, cheers! =)