Did you base of the normal Bean? Try to take a look at this:
Really, it looks good... On concept. And just to ask something? What is that in the middle of Bean's eyes? A nose? Can a duck have a nose Sonic-like? No! He is a duck! So, try to make the nose look like it has some depth. How does the legs blend from green into yellow? Look at this:
Do you notice what I mean? your sprite looks like it suddenly changes from green to yellow. I know this is your first sprite, just giving some tips.