Signs Of Alien Engineering On Mars?

marsrovers.jpl.nasa.gov... Dave Beamer found Martians in the upper right corner. I circled more I found,but the bigger find is something that all can see who don't see faces,just rocks.I found an "X" smbol/Mars grafitti/artwork like a poster on a flat rock centered like a sign.This is clearly a definite marking of a rock the size of your arms. Pan cam sol 974 Op rover.