At first, seeing this pic in lower resolution, I did not see the eyes at all. I saw this as a dark archway. Then I saw the legs, and thought, "Oh, that's clever, something halfway visible crawling from darkness."
THEN I saw that the "archway" didn't match the wall at all, and I thought "Ahhh, now THAT is clever. The darkness molds itself as a shadow that almost matches the arches of the surrounding architecture, and looks even more frightening because it doesn't fit on the second glance after the viewer's eyes are attracted to the black on its own."
Then I looked at the higher resolution, spotted the eyes and thought, "Oh. Those would have been good ideas had the eyes not been there to attract my attention right away."
Good job on this pic, because it made me notice some creepy usage of negative space and composition I wish I had as an instinctual artistic talent.