These are drawings of actual IRL ancient greek artefacts. INC:

A golden death-mask from ancient city of Mycenae, made around 1525 BC, said to be mask of legendary King Agamemnon (by which I mean there is no solid fact to support this, somebody just named it so to make it seem more cool)

Bust of Hippocrates the physician. This bust was in fact a Roman copy of an older Greek original. From around 400 BC

A painted lekythos vessel from around 530 BC

A silver Athenian tetradrachm coin. Because Athena was the patron goddess of Athens, Athenian coins often bore her symbol; the little owl. Made around 450 BC