The proportions are remarkably accurate, the weight of the line consistently even, in outline only (no visible facial features, representations of breasts, nor muscles), the pose is vaguely Classical Greek (one side of the figure is animated with extended arm and turned leg), and there is an indication of calves in the lower legs—which I think is unheard of in another glyphs anywhere (that I am aware of).
I could be very wrong, but it’s accuracy and mammoth size lead me to conclude that it is a piece of modern art made in secret or possibly a hoax if it it is being considered as prehistoric. If the figure was made from digging grooves in the ground, placing rocks on the place, or uncovering a substrate of another color, some indication of its true age might be found.
JM.02
See post #2