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Try to post photos a bit smaller in size. The second one was especially huge!!!

Personally, the photos are very boring. Non of them have a subject (except the sunset) to focus on.

#1 - Clouds - There are countless numbers of cloud pictures out there. And yes, they are fun to photograph (some reason more so in other countries *shrugs*) but lacks the "umph" to make it stand out among all the other cloud photos.

#2 - Sunset - Sunsets are pretty, but again, like clouds, they can become very generic. Two things that this picture has is that the image is either blurred or out of focus and your sun is smack dab in the middle of the frame. When working with photos remember the Rule of Thirds, more often then not it will really help your photo (but there are times to break it).
With this, it's another sunset in the center of the frame. Adding people, bits of the landscape (a tree, plants, a dune w/ grass) can give the photo more character.

#3 - Ocean - Again, there's no real focus to this photo. Oceans are beautiful (especially with the rich blue color you've got in this photo) but it's not enough to make it stand out. You are on the right track with the rule of thirds (1/3 land, 1/3 water, 1/3-ish sky).