Date of discovery: June 25, 2016
Location of discovery: Mars, Sol 1376
NASA source: http://mars.jpl.nasa.gov/msl-raw-images/proj/msl/redops/ods/surface/sol/01376/opgs/edr/ncam/NRB_519658360EDR_F0550000NCAM07753M_.JPG
I found this face today on the side of a hill in a recent Curiosity rover photo. The face does look human, but due to its eroded detail, its difficult to be sure about that. Sometimes its a bit difficult, especially with these black and white photos NASA gives us.
Scott C. Waring