First of all, I like the shot. I'm a sucker for still lifes like this, except I can never visualize them. You obviously have a good eye for it. Now, since you've asked, I'll give you my totally amateur opinion/critique. (BTW, you've seen my shots so that should give you some idea of how little I know about it, and how much my advice is worth.)
Nice framing and colors. The overhead light was a little harsh since you've really got a wide dynamic range going on here. The lights are almost too light, but the darks are almost completely dark. Not sure you could've done much else about it. I wonder how a little bit of flash bounced off the back would've done.
I like the idea and your composition. If only the light would cooperate for you.