You name the work as "Primative", and I see the faint traces of a face like a mandrill face...
Really looks like a mandrill pictured on a cavern wall eons of time ago (thus, the image weathered and worn), and you've hold out a torch upon the wall and explore the image at present time... :-)

1 GB for an image..!!!
You really must be working with the supercomps that NASA also uses... :))