1 - I would have put the headstone at the right side of the frame; it looks just a bit crowded this way. (unless there was something to the left of the stone that would have ruined it?)
2 - Nice. Could use a bit more DoF, so that the guy's last name is more legible too. Maybe widen it up a bit to include the year he died.
3 - This one is my favorite. It needs nothing. I'd be tempted to try it as a B&W though, just for kicks.
4 - Again, since the stones are "facing" left, they should be more to the right of the frame, so as not to appear crowded. This is a kind of a variation on 3, but I think 3 works better because the selective DoF is on the middle stone with the 1st & 3rd stones blurry.
5 - I would have been tempted to yank out that clump of grass, focus on the text on the stone, with the fore- and background grass blurred.
6&7 - These don't do anything for me.
8 - This would have been good if not for the background. With a much shallower DoF it might have worked better. I like EYEAM4ANARCHY's cropped version a bit better, as the background isn't so distracting.
Kudos for not doing any editing. It takes nerve, these days, and an unedited photo as good as your 3 means more to me than a heavily edited one that may seem "better".