CHARAPYRUS TRAIN, CHOO CHOO BITCH™
As for the pupils, I'm currently on board with Zarla's eye-glow theory, that different colours can mean different emotions. This pale pink colour would probably be romantic love.
I officially challenge anyone reading this, if they feel like they're up to it, to draw something like this, but with their Undertale OTP (could be Torigore, Sansby, something else, WHATEVER IT IS :3)! Tag me so I can see it! :D