Cool, I like the design.
The next darkest color from the body is the blue in his eye.
There are also other opportunities to recycle colors and blend, such as the face etc.
1.bp.blogspot.com/-93PNElthCdk/Ua7OqU7_HzI/AAAAAAAAGYc/pJGd7xk7mVU/s1600/mDog_2.gif
Nice piece =)
Too bad the well done flames don't act as a light source for the dog (which doesn't have any btw).
Also many lines and shapes could be cleaned up.
Also agree with PPD about AA.