You've really topped yourself this time; those tiles really sell the piece. The color choices are especially nice, but the shading in the sockets is too dark by far, especally considering how luminescent the rest of the skull is
If you want to knock this one out of the park, do something with the grout to make it look more recessed and possibly rimlight two edges of each tile to pop them out. But this is still one of your best works as is...
Afraid of Sunlight - http://www.ledante.com