Did you use http://scavenging.files.wordpress.com/2009/04/rubber-duckie.jpg as reference?
i don't dig the plain white on the beak...
needs way more contrast... jinn's edit looks more like a squeaky ducky...
{ Something like this would be more cool... IMO.
You did a good job with the dithering, but I agree with Pumpkinbot. Maybe if you just change the dark yellow to a darker yellow.
Yes i think i did. Im not sure. i know i have a link somewhere...