“There is a subtle difference between the image of an known imaginary creature and a possible image of a known actual creature.”
Since no one now knows what the dinosaurs actually looked like your statement is nonsense.
And again you’d be wrong.
While we do have a few patches of fossilized hide, giving a sense of texture and occasionally some chemical hints at likely coloration, so you might say we don’t know what their specific coloration was like, we DO have reasonable ideas about how their muscles and therefore their bodies would have looked with flesh stil, on them.
And the carving you are fussing against gets pretty darn close to that.