It's on the rearmost chandelier, in the back left of the photo. Look to the rightmost of the 3 shields on that chandelier. Go to the center pattern that runs up the middle of the shield, with the circles in the vertical line. At the bottom of that line of circles, second from the bottom, is a black mickey head:
Don't worry...I took the photo, and didn't notice it! (I knew the hidden mickeys were there, I just didn't realize I had caught one in that photo).