I was at St. Patrick Church in Chicago this morning to take photos for celebrating St. Patrick's Day. I heard an Irish song.
Influences come from everywhere but when you are actually shooting you work primarily by instinct. But what is instinct? It is a lifetime accumulation of influence: experience, knowledge, seeing and hearing. There is little time for reflection in taking a photograph. All your experiences come to a peak and you work on two levels: conscious and unconscious.
There are no rules and regulations for perfect composition. If there were we would be able to put all the information into a computer and would come out with a masterpiece. We know that's impossible. You have to compose by the seat of your pants.