My head cannon for the serpent

So I know it's kinda not a place for this kind of things and surely it's not important for saving your soul. But when I first red a few chapters from the book of genesis I spotted palace where God said that in Punishment for seducing eve the serpent will now crawl on their belly. So... Now. And before he didn't? But wouldn't it be a lizard then? So my head cannon is that a serpent were actually a dragon with wings and pawns and stuff. I bet it looked cool