(Dec 30 2014) My worries in posting the stone head on Mars were centered around absolute confirmation the original image really did come from the Mars rovers.
I was not concerned with whether or not it was in the picture (it so obviously is) and instead focused on making sure I was getting a genuine image from JPL and that Nasa does not do these types of things as a joke. They do not, and the image really is from Mars.
The carved head image now circulating the web was rendered by me over several hours from the original Nasa photo using only standard filters (not edited, only rendered) and did not come from elsewhere.
I originally thought the Mars rovers were a hoax running around the desert in Arizona. This is because there were coins, bones, an obvious animal skull and other things showing up in the Mars rover photos. I thought it was all a psy op.
But there are no Aztec style carved heads in North America, especially none based on faces that look like they are white, and because one was photographed by a rover I changed my mind - the rovers really are on Mars and they are driving around the surface of a recently destroyed planet that was very much like Earth not so long ago.