|Let's get the basics out of the way first: the exposure's fine. :) I might prefer to have the bench out of there, but hey, I realize you took a photo of a real place, not a staged shot.
I don't find the wall all that interesting to look at. The texture's kind of washed out, although the stones in the upper right provide some variety.
But what's interesting is that I'm having a figure-ground problem. That is, I first saw the two green areas as the subject, and thought "huh. waayyy off-center in a very deliberate manner."
Then my mind flipped and saw the central column as the subject. I quite literally hadn't even glanced at it at first.
And then I flipped back again.
So it hits me more like an abstract. If that's your intention, you did it very well. :)