His mouth looks different, looking green, having no tongue and looking less open. What's changed about it? Just curious.

It's a mouth-light that flashes in sync with his words, like your art.

Ah, that's really cool, and I'm glad it's inspired by my artwork. I kind of have a thing for robotic animal characters, it's something you don't see often in fiction, or at least not "anthro" ones, since usually animal robots tend to be feral.

I think his robot form talking with a glowing mouth instead of a moving one makes him more "robotic", while the other fits the cartoony artstyle you draw your character in, but I like this one with the glowing mouth a bit more.