Really quick edit, but I hope it gets the idea through :) http://i208.photobucket.com/albums/bb184/plutoking/kansai-1.png
Firstly, you don't need all these shades. Secondly, the circles form is a bit odd, it's MS paint circle tool, right? Your shading doesn't really give it much depth, and some of it doesn't really match up with the lightsource.
Elwin