Dog:
I've enlarged that first photo that has what looks like a bird and a shape I called a snake and the more I stared at that "snake" the more I'm sure that I made a mistake in that. It's actually a SQUIRREL, of all things. That left part is it's fluffed out tail and you can see short, black tick lines on the bottom of the body that means it's legs. It's head, on the right end is trianglar shape with a white spot for an eye and just above the head is a solid, black dot. There ARE numbers / letters on the face of the rock around it.
Also, I believe that bird is a buzzard or vulture.......not an eagle. It's beak is elongated and the end is a fat, slightly hooked shape of a carrion eater, not an eagle. This rock also has letters / numbers.
On the next photo, look at that black triangle you circled on the right. The apex point is pointing up at a large black figure of a squirrel, with a white spot for an eye. At first I thought it was a dragon because of the short wings, but then thought, " hell, that means that's a FLYING squirrel. There's a small, black dot just above IT'S head, too.
Way over toward the left, at the bottom of the photo, is a large, black bat, looking up. Bats live in caves, grottos, barns, sheds, attics,......anywhere that is protected from the sun. Squirrels live in the trees, but also will burrough into the ground. You have a regular squirrel running from something, in that first picture. It had a triangle head with a white eye. The next squirrel is a flying squirrell that jumps out of trees or other high places to get to the ground or a lower branch, quickly. That flying squirrel has a rounded head with a white eye and a black spot just over IT'S head like the first one. The bat is looking up as if to zero in on it's resting spot for the coming night fall.
The first place I would look is behind that tree / bush crop in the top center of your second photo. That tree / bush has grown to a pretty good size and would need a good patch of dirt to set it's root structure. There are one or two other spots in the second photo that could be covers. I'll tag copies of these 2 pics tomorrow. For now, I'll post enlarged copies without the tags, so you can see what I've described. Dog, I appologize for mislabelling that figure as a snake instead of a squirrell. Even though it's indicating the same direction, the squirrel thing adds more info than it's being a snake. I thought maybe you should look for a snake and then the spot above the next snake's hed, but the squirrel changed what to look for BIG time.
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Is that large, black figure down and to the right of the black triangle a large black left hand and forearm giving the "thumbs up" sign

?? Could it also mean GO up and to the left

?