How to improve your photo
Watch your exposure to make sure the elements you wish to record are rendered the way you would like. The digital sensor records a much narrower range of brightness levels than we can see with our eyes, so sometimes a compromise needs to be made to ensure highlight detail, for example, is not blown out to pure white and some details are retained. Sometimes, this can be corrected in image processing software like Photoshop, but it's better to get it in the camera first, then you don't have to worry about "fixing it in Photoshop" later.
Check horizon lines and verticals to make sure they are correct. Some cameras now have the ability to show grid lines either in the viewfinder or on the LCD screen in live view. Other cameras allow the viewfinder to be replaced with one showing a grid or other marks. without the benefit of either, I use the vertical and horizontal lines of my focus point to assist me in lining up vertical and horizontal lines of my subject. You can also use a bubble level (there are several types that attach to a tripod, tripod head, or even the hot shoe on your camera body), but I've often ended up with crooked horizons despite the bubble indicating my camera was perfectly level. Another way is to simply visually 'measure' where the horizon line or vertical line exits out of the frame on each side and "eyeball" level. You shouldn't be too far off and can adjust the fine tune later on the computer.
If you intend to use some of your photos to license in either commercial, editorial or stock, adding a person or two (a couple walking on the beach for example) will make shots like this more appealing to that market, i.e. tourism and travel magazines, hotels, travel bureaus, etc.