Alongside, you see a statue of Calliope, made in 2nd century Rome in imitation of an earlier Greek statue, so you now know how the Ancients imagined Calliope looked.
Aren't the Hunt figures just gorgeous? The silver lustre on their garments and the lovely soft green are just too pretty. Silver lustering was introduced commercially from 1805, so the figures can't have been made before 1805, but I would be surprised if they were made any later than 1810. The soft greens don't appear to contain chromium (which was only added to green after 1805), but there is no way to know for certain without testing---and I expect green-without-chromium continued in use for a few more years.
If you know who the other muse in the Hunt Collection might be, please share!