I'm at work so I can't quite take the time to inspect every single detail, but I'd start with the clothing, to determine if its a chiton or toga, or any variation of the former. After that, it's onto the sandals, from there its discernible that its either a Greek or Roman figure, and that should narrow it down.
My bets for Roman are: Zeno of Sidon or Philodemus
For Greek: Hermarchus or Polyenus, if not, then Metrodorus based off of the figure alone.