I agree with Skeddles.

And why not have a little life out there: people, a penguin, or even just footsteps.

Looks pretty good. Some suggestions, if I may: Use more contrast in your colors, use less dithering, especially on pieces like this where you want it to look shiny, and if you can, try to shade each block separately, like give a little highlight to each one, it's make the piece much more detailed and such.