You can’t go wrong with the Rule of Thirds, the classic photographer’s tip for creating interesting images. When you’re setting up a shot, mentally divide your LCD screen or viewfinder into nine squares. Place the primary subject where two of those squares intersect.
If all this talk of imaginary lines makes your head spin, just remember not to plop your primary focal point in the center of your photos. Set up the shot so the prime point of interest is a bit to the left or right of the midpoint.