Love it!
Now you have to do the happy mask to go with it!
nice job! Couple of suggestions-
Line art could be cleaned up, especially at back right.
Too many similar colors
Too plain colors. with pixel art you can use much more interesting color combinations
Black is a bit too strong. In most pixel art, especially at small sizes, it is good to avoid pure black or white
there is some banding on the edges of the line art
Here's an edit idea: http://i.imgur.com/fdL2sp6.png
Thank you very much!
Really liked the suggestions and I intend to use in future jobs.