Often, we are inspired by shapes. Sometimes, shapes are odd. Like here: I am struck by the thought that these ducks could be some kind of lobster seen from above.
Can you also see how I use negative space, and how I use the rule of thirds?
Those are just some of the things you think about when composing a photo. I am writing an eighth book which will talk about compositional aspects of photography. Stay tuned! And meanwhile check my seven other books at http://learning.photography