I studied photographer William Eggleston in a Photography class in graduate school, and this line from the New York Times Style Magazine featuring The Greats, including William Eggleston, resonated with me as I was reminded of his work:

Eggleston’s images can trick you if you’re not careful. You have to look at them, then you have to look again and then keep looking until the reason he took the picture kind of clicks in your chest. 

The aesthetic value of the photograph might not be immediately apparent, but after looking at it, taking your eyes off it, and looking again, the photograph may start to move you in some way; and it may move you in different ways each time you look at it.