How many time have you taken what you thought would be a great picture and after you look at it you realize the photo’s background is too busy and lacks impact? I’ve done it.
Cameras have a tendency to flatten an image unlike the eye which can distinguish between the different elements in a photograph.
Pay attention to what is in the background. If you are shooting a portrait set your f-stop on f/8 or f/5.6. This way you will get an out of focus background and your eye will focus in the person instead of a busy background. Pay attentions to bright background also. Light backgrounds usually distract from the subject.
The background can ruin a photo or make a photo so always look at the background before and imagine how it will affect your photo.
The photos below will reinforce what is written in this post.