Seems to be too much sky. I'd like to really emphasize the headstones and have them be in super sharp focus with less black sky. There seems to be a strange black blob in the middle of the picture to the right of the headstones like something was cloned out and the black seems noisy.
The stones do a godd job of taking our eye from top to... middle!! Shooting from a lower angle would have had the benefit of not having the tombstones exit the frame right in the middle AND get rid of that dead space at the top.
the rhythm of the dead, a clock-like rhythm, overdetermined. Your title is a revelation, and so is the picture. They are marching like a rolodex. Who is next?
I'm wondering how a tombstone can be overexposed when shot in the middle of the night... Nice idea. Composition could use some work though. Generally its advisable to avoid splitting a shot in half with the horizon line.