If we assume Cereza is an average-sized 4 year old kid, which seems to be the case because I count 5-6 heads from plain sight, the original Bayonetta seems to support this:
Bayonetta is huge. Which is actually fairly standard for superhero design. Or at least not completely out of the norm, particularly for villains.... Used to be around 9 heads in jack Kirby's days,
But, once people really started thinking about SUPERhumans, it shot well past 12.
now we are looking at typically anywhere from 10-14.
And yeah, like you said, if you pay attention to her surroundings, for example, that horizontal bar behind bayonetta was very purposefully placed there. Its about the size of a tall six foot man. you will find bayonetta is every bit the monster proportionally as Madama butterfly. Which probably happened when she made the pact to become her mortal avatar for the powers. I think its important to remember this isnt a mistake... Bayonetta IS a monster.