When you compose your image it is important to consider the background in your shot because you background can help or hurt your image. A background that is busy or that has undesirable elements in it can detract from your photograph. Think about a beautiful couple but a few feet behind them in the shot is a full and ugly garbage can. The garbage can is distracting and takes the viewer's focus away from the subject and onto the background elements. To avoid this be mindful and consider your background. You will be able to make quick changes to your perspective and point of view that will allow you to capture your subject in the best way possible for that particular scene. I suggest starting with taking a few steps to the left or right and looking again. Sometimes that is all you need to do. Here is a example of how much two steps in one direction can drastically change an image.