Ask them to send you a photo, if they do - look at it. Seeing as mIRC doesn't control the IRC protocol, and the IRC protocol is text-only anyway, it would be impossible for a 'feature' which did it any better.
I mean it's more easy to chat with someone, when you first see his/her photo!
Err.. not really. Maybe it's easier to have
cybersex when you have an alleged photo of them, but it's certainly not easier to chat.