I'm late to the party and I think it's mostly all been said, but just to add that IMHO if you don't want to be outed either now or in the future, never show your face on anything or send identifying photos. It's up to each girl to decide what's right for her, but you seem to be in the same camp as I am on this.
I've refused to send face photos stacks of times, as the others have said there are alot of prossie haters/photo collectors/TWs out there, and I tend to think they are just timewasters/photo collectors wanting to see what you look like. I can understand some guys do want to see face pictures before booking, well they can book someone with face photos...simples!
Even if they were genuine and I would have got those bookings, I still don't regret it for a split second. My privacy is worth a hell of a lot more to me than my hourly rate.