If someone looks at one of your images and has no idea what the subject is then by all accounts you have failed to convey your message. As photographers it is our job to define the subject of our images. This can be a difficult task, even more so for landscape photographers. Why? Because when we get to a majestic location it is easy to just get caught up in the moment and not take the time to define our subjects. As artists we make the decisions and define our subject by what we choose to include or exclude.
Take the two images included here. They were both shot on the same day and at the same time. The subject of the image on the left is the amazing cloud structure that was present. The mountains in this scene are important but the subject is the clouds. The image on the right is of the same mountains but I have chosen to isolate one particular section. It gives a definite foreground, middle ground, and background. The subject here is the rolling hills in a sea of fog leading to a very colorful sky. In this instance I decided not to show much of the sky because, while important to the photograph, it was not my subject.
The next time you are out with your camera think about what your subject is and how you want to bring attention to that subject. Start thinking like an artist and not just a person with a camera.