http://spamtheweb.com/ul/upload/071008/42176_zsl.png (http://spamtheweb.com/ul/upload/071008/42176_zsl.png)
tone down on the values in his shading, if there's no background then there really isn't a point to have sharp jumps in color
a zsl
http://campnorth.tv/userart/nikko4877e0f66...a0010a3dde2.png (http://campnorth.tv/userart/nikko4877e0f664cb1a7238773345a0010a3dde2.png)
Make the background contrast less. It's on the opposite side of the colour wheel.