not very original, doesnt have any personality... also , what about the recycling part?....
also where are the 11 colors (actually its 12...)?... ur shading tones arent distinguish at all, u need much more contrast.... when raising contrast ur pillowshading gets pretty visibel and results in outragous banding issues.... also it seems like the light is hitting the upper bun from the bottom and the lower one from top... dont try to make up ur shading by some kind of "formula".... try to actually feel the forms and volumes and sculpt them with shading...
Onek summed up what I had to say.
Needs improvement.