|Overlooking Havana, Cuba|
The next example here I used a larger aperture blurring the background. When you have a person in front of a blurry background there is a sizable amount of separation. Your eyes do not get confused and tend to go directly to the subject.
I saw the door that is in the background and thought that it would make a fantastic backdrop for some portrait work. I positioned the individual about ten feet in front and used a long lens with a wide open aperture. This allowed me to compress and enlarge the background and blur it at the same time, providing excellent separation.