Take a look at both pictures. Both photographers took a shot of a road. In the first one, there are no people, and in the second, we see two people walking.
Decide the focus of your story much like a photographer decides to focus on something in his photo.
What is important to you in this picture?
What is important to a reader?
Is it easier to write a story based on the first photo or the second?
What freedom does the first photo give you that the second does not?
Are the people in the second photo characters in your story? What are their names?
Does the black and white photo inspire you to write or does the color one?
Does the color affect the mood of the story you're writing?
Heavy, writerly stuff, eh?
Now....focus, focus, FOCUS!