If he is considering her, he should tell his parents and have them set up a meeting with the girl and her mahram. You can see her during this meeting.

A sister has been suggested by a friend to consider a boy for marriage. She saw the picture of the boy on Facebook, now the boy has been informed to consider this sister but he has no idea how she looks to move further with the talk and involving parents. The girl already informed the mother but don’t know how to take this further because without seeing and knowing. What is to be done?