I have had 4 decades+ of close-up observation of several women who were psychotic (I mean this in a layman's, not a clinical sense), and there is a deranged look in their eye that is instantly recognizable. Whenever I've seen it I've been right.
Confused? Think "Hitlery Klintoon".
Full Disclosure: Something about Osteen gets on my nerves, the earlier line about "Vaseline on the teeth" is fairly close. But I haven't definitively made up my mind one way or the other yet.
Cheers!