I like the concept of the shot. The child peering though the matte leads me to wonder what he's looking at. I however am unclear as to how the squares were done. Some Photographer Comments would help here. Based upon what I see, I think that you must of projected them with a transparency projector. With your camera settings as they were that light must have been really bright. That said, the lighting seems a little flat. I would like to have a true white within the border or darker black in the shadow or perhaps it's just that the squares are at an angle... I can't pindown what it is, but the image doesn't grab me. The elements are all here it but don't click for me.
Cute expression. Like to know how you did this because it appears to have been done in to distinct steps ( the shadows of the squares on the box at the bottom and top. This detracts from the overall photo.
Composition: Good
Technical: Excellent focus. Seems over-sharpened? (White line around the edge of the cut-out?)
Meets challenge: Yes
Overall impression: Good idea and well done. 7