Perspective of the image would be different on all 3 planes...

nice idea

I agree with CMYK46. Even though the cube is 3d, the image still looks 2d. Try taking sections of the image and use free transform to bend the image to match the 3d cube better. I'm sure someone else might have a good suggestion as well to do this.

I´m pretty sure u can dowlnload that filter somewhere, so it gives the perspective, nice idea.

Take sections as jawshoewhah suggested and use Transform/Perspective tool or Vanishing Point.

You have a good start...this could be great! Try the vanishing point filter to change the top and side planes give more of the cube look you are going for. Also, you could change one or two squares to make the puzzle look unfinished. These are just suggestions but the possibilities are really endless! Good luck

i like this image. i agree with the other posters, the picture needed to be warp or the such like to make it cube like . Adding a little shading to the sides to give a lighting difference may also improve the 3D effect of your image. GL