Anything that excites me for any reason, I will photograph; not searching for unusual subject matter, but making the commonplace unusual.
Edward Weston
Looks like it's sticking out to me, but I get fooled by photos of Moon craters, too!
Here's something interesting: Rotate the photo 90 degrees clockwise and the footprint definitely looks indented. But, rotate it counterclockwise, and it looks like it protrudes from the sand. It all depends on where the shadows and highlights are.
Russ