interjection:
If Chazal said that it is forbidden for a man to betroth a woman
before he has seen her, they must have considered her appearance
a significant factor for many (perhaps even all) people.
Can you not then accept that it may be a significant factor for the boy
in question, and so, he may not want to spend time and money on dating
without making sure that this one factor has already been verified?
Of course, if you refuse to send a picture because
you feel that sending a picture is not tzanua,
you don’t think they truly reflect personal appearance,
you don’t think it’s boys but their mothers looking you over, or
you are not interested in a boy to whom this factor has such significance,
I can’t argue with your decision.