The woman in the photo is very upset. Imagine that there's someone off-stage talking to her. What are they talking about? What is their relationship? Does the off-stage character know why the woman is upset, or did she just come upon her? Does the crying woman know the other person? Is she a nurse? A doctor? A relative?
Where is the scene taking place? Why is the woman upset? You may not know until you write the dialogue.
Before you begin to write the dialogue, ask: "Whose point of view am I going to use? Who draws me the most and is most open to letting me see the world through her or his eyes?" Remember, you can be inside the mind, body, and heart of only your point of view character. The reader knows only what she is thinking. The other characters can speak and act, but you don't know what they are thinking or feeling. This is the essence of point of view, which is most powerfully expressed through dialogue.