My photographs are not planned or composed in advance, and I do not anticipate that the onlooker will share my viewpoint. However, I feel that if my photograph leaves an image on his mind, something has been accomplished.”
— Robert Frank

And I feel exactly the same way. I just returned from a trip to Puerto Rico but I managed to capture zero frames. Has that ever happened to you? Although my purpose was not photography, you well know our eyes are always working full time. To be honest, I just didn’t have to much time and I don’t think I walked for more than 10 minutes combined but in truth, I felt a bit intimidated by some faces. The climate is a bit strained and not knowing the laws nor the street thinking, I felt it was prudent to hold back and observe. I think “observation” is a measure of any great photographer, not saying that I’m great, I’m just a simple aficionado, but that this quality is a must and I wouldn’t doubt many of the great observed with great enthusiasm there surrounding before capturing those magical moments or the le moment decisif.