

See the difference?
One photo has a cluttered background and the other one is clean, with a pattern. The distraction in the second photo is less eminent and helps focus the viewer on the people pictured.
If you can’t move any objects out of your frame, you can try to move the people you photograph closer to the lens. If you work with a wide aperture or a long lens, the background might blur to an extent to make the unwanted disappear.
Also: Pay attention that nothing »grows« out of anyone’s head! Poles, trees, lines etc.

