I'm guessing the title was supposed to be a reference to Beezlebub. I'm not quite sure if that's the same figure as the Devil himself. This guy actually looks more like a deranged Pikachu. Anyway, this is a great picture. Dude, that shouldn't be in a children's book of any kind. That's scary to me as an adult!
This looks a lot like an engraving. It seems like something you'd see in the Middle Ages. You have designed this character very well. It's great that you are so creative. Even this thing's hairs are creepy.