Once I got in to the habit of uploading my daily cache of shots on to the computer and looking through them to choose and sometimes to crop, I noticed that something in my torso would change. There would be a quickening, an excitement on one shot that wasn't there on its near twin neighbour.
Later I began to see how in the exciting shot, a diagonal might pierce the top right corner, or sudden light had flared at that moment.
Take time, when you are viewing your shots to be open to this sense. They often talking about someone developing their eye, or having a good eye. Maybe we can also develop a good heart and gut.