Humanoid Skull on Mars???

When I first saw this I thought it was bs but then I checked out the original picture from the NASA website and I was surprised... could it be some sort of lighting effect???

In the picture you can clearly see the "skull" near the lower left-hand corner...




You can see the original page.

Any thoughts on this from you guys??

I think its just a funny shaped rock mixed with the lighting effect.

Great find. That is harder to spot then waldo!
But it seriously does look like a skull of a human.
That is pretty scary I wonder if they found it. . .