At least the whole fairy-tale explanation makes sense in the Monsterverse, since Ghidorah was on Earth when humanity was just rising, and they made fables of him, which eventually watered down into fairy tales through time.
Well that "three-headed dragon from fairy tales" is a simple, but identifiable design about traditional king ghidorah.
not offend the artist, i like this ghidorah interpretation and all his art.
but if had been official design, fans would've hated it.
Making fiction characters realistic sometimes don't ends well.