The picture is cool, and while I might like to have more pieces to the puzzle I guess that's not for everyone.
The big problem I had with this was the shadow of the completed puzzle in the background. Being able to compare the image on a piece to a finished picture is all well and good, but why leave the outline of the piece showing?! That made the puzzle a tad to easy, as the background tells you what shape the piece in that particular location must be.
I hope you make more of these without the outlines of pieces showing.