The challenge in this photo and the challenge in every close-up and portrait is to isolate the subject by achieving a beautiful blur background. Background has its own importance and can define the quality of the photo; if it is a snapshot or not. In this photo if the depth of field was large and all the background was clearly seen no one could appreciate the beauty of the wild rose hips with the rain drops on them.
The basic key steps to create this blurrity are four:
In close-ups and portraits these steps usually give a beautiful blur background. And, the more blur background we succeed, the better our photos look as we manage to isolate our subject.
Of course, there are other aspects to take care, like the angle you choose and the light you have, but you have to experiment we all these factors to succeed your image of desire. As the Hungarian artist Laszlo Moholy-Nagy wrote, “The enemy of photography is the convention, the fixed rules of ‘how to do.’ The salvation of photography comes from the experiment”.