Undoubtably, someone will pitch a tent over it.
Either that, or someone will pitch a fit over it.

I’m surprised by this. I’ve always read that the Greeks and Romans never mentioned or depicted female centaurs, and that it was assumed the female counterpart of centaurs were dryads and nymphs. Although, I could be thinking of satyrs. A third possibility is that the all satyrs and centaurs were male, and that dryads and nymphs were their female counterparts.
Re The Polish Mermaid
I disagree that her hips are too wide. But, her torso seems to be done in the Rennaissance style of ‘I always draw naked men, and then make some minor alterations to make the drawing into a woman.’
Well, here’s a counterexample, then. Although it must be admitted that Lucian was relatively late, from a time when people didn’t mind “playing around” with the older ideas about mythological figures (his treatments of the gods would be seen as downright blasphemous to a Greek or Roman from a few hundred years earlier). I don’t know of any really old depictions of female centaurs.
Today, of course, they’re all over the place.