Sonic custom model - would like feedback

[Halfbit]

So...Mobians SHOULDN'T have side mouths?

I think side-mouths are fine for 2D renditions. Not entirely sure about 3D though. I think they're good for certain expressions in 3D (like Sonic's signature grin), but maybe center-mouths would be better as the default-position, like what they did in Sonic Adventure 2.