Kalliope is one of the nine Muses, sister Goddesses of inspiration and the arts in Greek thought. She and Her sisters are the daughters of Mnemosyne, the Goddess of memory, and Zeus. Kalliope is the leader of the Muses and the Muse of epic poetry.
I have given Kalliope a kithara, an instrument in the lyre family which was considered the professional's instrument. The leash for the plectrum (the thing she's holding to pluck the strings) is straight off a vase painting.
I gave the Muses similar faces so They'd look like sisters; the color violet (or the flower violet) is associated with Them, and so also I've put Them in various shades of that color, because the Goddesses of Music (among other things) should of course harmonize with each other. Done as part of a commission of all Nine of Them.