Absolutely fascinating. I'm surprised by the quality. Indicative of both a keen eye and a fine skill for art.
"A petroglyph is an image created by removing part of a rock surface by incising, picking, carving, or abrading, as a form of rock art."
Why not both? It's obvious some effort was put into carving the figures as they look pretty to me. I am sure some people were better than others at making rock carvings making them artists IMO.
That still fails to distinguish between "art" and "not-art". Your faulty assumption is that art can not serve a practical purpose.
— Rudyard Kipling, The Conundrum of the Workshops