Well, not being a virtue ethicist myself, I'm probably not the best guy to ask.

My question for virtue ethicists is "well, OK, but how do you tell who is virtuous?"

Then again, a virtue ethicist can just as reasonably ask "well, OK, but how do you tell what consequences are desirable?" to which I, as a consequentialist, essentially reply "I consult my intuitions about value." Life has more value than death, joy has more value than suffering, growth has more value than stagnation, and so forth. How do I know that? Geez, I dunno. I just know.

Presumably a virtue ethicist can just as readily reply "I consult my intuitions about virtue." I suppose it's no less reasonable.