I am sure you saw something very artistic in the image, otherwise you wouldn't have taken it. Unfortunately I am not sure what it was. Found the image extremely unpleasant. It had no meaning to me, or at least I could not discern one.
I am having a hard time with the perspective on this image. Either the skull should be very crisp and in sharp focus if the background is going to be blurred or their should be a different angle on the monument. Overall it just isn't working for me technically and as a subject.
Looks like there is a bit of camera shake from the low-light, but I'd have thought an application of USM could sort that out. I like the colours all being around the same brown tone, however I think the photo needs a bit more contrast to give it extra impact.