Note from The Black Vault: The image in this case file was discovered while digging through a massive archive of “raw” photos taken from the surface of Mars. Many scour these types of photos to see what may be on the surface of Mars.
In this particular case, BlackVault User: Willease (who credits user “Mike_Edwards” for the find) posted this photo that has, what appears to be, a face partially buried in the Martian dirt.
Although this may just be a trick of light, shadows, and this is “only a rock” – it is archived here for research.
You will also find the high-resolution photo to download below, along with the original source NASA link (live and working as of 2/6/2014).