I'm in the minority, but i definitely think the toothy grin on #2.

I like the original best so I vote #1.

They are sew cute. However, the toothy smile for me just doesn't do it. I like 1 and 3, one being my favorite.

They are the cutiest things. They made me smile :) #3

i like the smile, but the toothy grin is cute, too

They are adorable. All three of them.

I like the last one best! Very cute

I vote for the second pic

I like the bottom one, but I think you should consider adding a cute, comical hat.

I like no mouth, then the smile. What about a smaller mouth, making a "moue?" Not sure that's spelled right. Is this a gift or for you? You could always put velcro on the backs and make interchangeable mouths depending on the mood of the day ;)