If this is a scam, the real owner of the pictures sure has nothing to do with it and likely she will not reply to messages out of the blue from no one.
The situation you describe is obviously a scam: anyone you never met in person asking for money, no matter the reason, is not a person to trust.
An identity can be easily stolen, a phone number can be spoofed. Ask your friend to copy-paste parts of the emails received from "her" in Google - he will find the same messages, word by word, reported by other victims of online romance scams.
If he is in this fake relationship for long time, the scammer already managed to get him under control and anything anyone will say will be twisted by the scammer who will not want to lose that control.
It is hard to convince him if he decided to trust the scammer more as he trusts real people near. In similar cases, people were contacting the local police for help in explaining the situation to the victim in denial. In other cases, victims in denial were asking here for confirmation, after their friends warned them, and we were able to check the details the victim shared with us about the scammer and confirm that it was a scam.
Show your friend this link:
viewtopic.php?f=21&t=1861. He may understand that what he sees on a screen or in a picture received online is not always the real person he is talking with. It might help.