Some titles might pop into your mind right away. You know what the image says to you. In other cases you might really have to think about it. That process can be fascinating & valuable. You know you like the image, but may not be sure why. Searching your mind for a title may help to clarify that for you. It may help you uncover the subconscious feelings, memories & fantasies that you associate with it. Coming up with a really good title might also help you alter & refine the image. The title may give you a direction for post processing. It is a great way to bring composition in line with the idea you may want to convey.