Seriously though, Donald Duck is the best Disney character. I went to Disneyland this past week and there was almost no Donald memorabilia and I was so gravely disappointed. Almost as disappointed as the fact I didn't get to hug Donald. Sad day.
The style here is definitely unique, and the colors are proportionate to what they should be.
Though the shading adds to the piece, it also detracts in as much as the shading contradicts each other on different areas (ie the head and hand).
Maybe a drop shadow would help it pop from the background more?
Criticism aside, I really REALLY do think this is a phenomenal piece of art. What you have done in reducing Donald to this form says loads for the iconic nature of the character and your skill as an artist. Rock on, fellow deviant, Rock On!