There's a shadow in front of that tombstone. Why is it angled differently than the shadow of the tombstone with the eagle on it?
And why do many of the tombstones have essentially no shadows at all, and those two have very distinct shadows?
I would say that that's a clump of green grass, and not a shadow. Look two tombstones to the right of it, to one marked "Marion E." It has no green clump of grass, and it has a shorter shadow for the tombstone. I think this is a fairly long-distance shot that foreshortens the ground, which is not flat. As a result, with the rising sun and the foreshortened shadows over the visually undulating ground, some shadows are longer and some shorter from the perspective of the camera. IMHO.