It's worth noting that classical statuary was typically painted and not left as blank white marble (the practice has persisted in some Catholic statuary). I doubt that any remaining pigment on statues (which might be recoverable through microscopy) was incorporated into the models for creating these images, but it would have been cool had it been.

For more on the painting of ancient statues, see, e.g., https://www.newyorker.com/magazine/2018/10/29/the-myth-of-wh...