Heya Anne and welcome to ThePhotoForum

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The camera that a photographer uses can be as basic as can be; it is the composition that "makes" a photo in the first place: When you see something nice that attracts your eye you want to frame it so another viewer might find it as interesting as you do, even though he was not there and did not feel what you felt. A photo will never evoke the very same feelings in a viewer as it did in yourself the moment you took the photo, but it should be composed in a manner that it evokes
some feelings,
some reaction in the viewer. And composition is one great and one very basic means to achieve that.
And when we look at wide-angle ladscape photography - or seascapes, fot that matter - the famous Rule of Thirds mentioned by kilifila before comes into play. In very wide total views, it is always advisable to look for some sort of foreground. It gives the picture scale and depth. Foreground elements should be in the outer thirds of the frame as not to take away from your scene; it should just add to it.
Or you go looking for some element that kind of "takes your eyes by the hand", something that leads your eyes into the picture. I guess your photos that include the jetty might do just that, but I haven't viewed those as yet.
One very important thing for seascape photos is: keep your horizon line level, don't let the water run out of one side of your frame, unless you very deliberately go for a very different angle. That purpose should show immediately, else tilted horizons may well look like a real and true mistake.
You have decided to join us here on TPF, though, and are brave enough to show us your work, you are willing to learn and therefore I am sure you'll show us some really great shots in no time!