A picture is a frozen moment in time. Pictures have to tell a story. So it's important to capture the mood of the time that is being frozen in time. The way she was dressed up, what she was doing, the chairs in the background, the location by the water. Everything tells us that she could be on vacation or on a enjoying a long weekend. The sunglasses, the dress and the way she is sitting tell us that it was bright day and the temperature was very comfortable.
When I look at this picture, I travel to a place of relaxation and tranquility.