I see nothing there that indicates the human hand at work. Any worked stone, without heavy erosion, shows signs of being worked. I have located Jesuit monuments that are no doubt carved but they expose the harder rock that is raised above the softer rock creating a rough surface that hides any tool marks. There are zillions of rocks that can look like something, just as every passing cloud can. My favorite is the Bertha Rock. It looks just like Burtha But's Bottom. Big. Really Big But, natural.