The important thing about photography as an art is, whether or not a photo comes out well, you took that particular photo for a reason. You saw something, either in the world or in your head or both - and that's your concept. That's what makes it interesting. That's what makes it worth looking at. Out of all the countless scenes flashing by you in your everyday life, you picked this one, for a reason.
Sometimes a photo is good enough that it works on its own, and sometimes the concept is obvious enough that it doesn't need expounding on. But other times, revealing or discussing the concept can really enhance the subjective impact of a photo. Even poor photos can be made interesting with a good concept, and good photos will obtain depth and dimension with a strong concept.