Like the 'T' visor of Greeks, or the cheekguards of romans, full 'bucket' helmets of medieval ages. Chain viels in the Middle East and India, masks in Japan.
But the Chinese ones I'm familiar with seem to leave the face fully exposed. The closest I can think of would be Ming/Qing brigandine.

even so it seems pretty exposed. I don't think I've seen a nose guard on Chinese helmets either.
But during Qin/Han up to early ming, did most helmets just leave the face exposed, or is it artistic license? As a fully visible face would be possibly more heroic and identifiable in an art piece than one covered in armor.
*I also recall some Chariot rider helmets which provided greater face coverage, but other than that it seems faces were left unprotected for most of history.
