Good photographers spend a lot of thought and energy on the background of their photos - sometimes as much as they spend on the subject itself. The most amazing subject matter can be overshadowed by a distracting background. There are a lot of ways to avoid this, such as changing the angle of elevation of the camera (go high or low), circling around the subject, eliminating extra light sources, etc. I work pretty hard at this myself.
Here I used the background to enhance the picture, with the edge of the glass almost disappearing into the dark cabinetry behind it.
Nikkor 18-105mm f/3.5-5.6
105mm - ISO 200
1/1.6s - f/5.6