Over time, I have learned to look twice through my viewfinder before I leave a particular setting.

The first time I look through it is to actually visualize what type of shot I want to take.

The second time I look through it is to see if there is anything I need to move, eliminate, or rearrange.

The reason I do this is to try to get the shot right in camera and to eliminate as much post work as possible.

Look how distracting the leash is in this shot.

I saw the leash on my second look and asked her to slowly drop it behind the dog making an ordinary shot into a great one. You can still see the leash, but it is no longer a focal point within the shot.