Hi. Some nice pictures among these. I am NOT wishing to be patronising, but there are some things you can do to improve your hobby.
The Nikon 7000 is a fine camera. It can easily handle the technical side for you, which leaves composition in your hands.
A few things:
Unless the sky is a spectacular feature, the chances are the land will be more interesting.
Symmetry is seldom interesting unless there is a really good reason for it.
Someone else mentioned the horizon... make sure it is level. Otherwise the ocean will run out.
The last hint is simplicity itself and alone will transform your pictures...
Imagine your frame divided into three vertical strips. Imagine your frame to be divided into three horizontal strips. Like noughts and crosses.Where the imaginary lines cross is called the 'intersection of thirds'. When you place the most important elements of your picture on one of the four crosspoints the picture will have more impact.
There are other things... selective focus etc, etc. Look at those later.
Most of these hints can also be applied later, before printing. Crop and print.
One last thought... Walk up closer. Fill the frame with the picture you want.
Have fun