When I first saw it, it looked a bit like Chewbacca; that was before I blew up the resolution, now we can clearly identify it as being greek.
There is one thing that I am not sure about in this. Although it obviously is Greek it has features that remind me of the Borg in Star Trek. This puzzled me for quite some time and I needed a rest to come up with a plausible theory.
The only way this could have happened is that the ancient greek were assimilated 2.000 years ago, lived on Mars for a while and left some of their Borg-statues, which are slighly weathered by now.
As to when and where to the Borg-Greeks left Mars, I am still trying to come up with a theory, so far i have none.
Any other theories? Please help me :).
For all the non believers, the source of the picture is the Curiosity Rover and the picture is available to the general public: http://mars.jpl.nasa.gov/msl-raw-images/msss/00113/mcam/0113MR0696010000E1_DXXX.jpg
