Beware! There is a popular scam at the moment involving nigerian scam artists who use a false photo and pretend to be US citizens, build up a relationship with a lady in the UK, and after a while asks for the lady to lend them some money for something like medical expenses for his daughter etc, or money for a ticket to the UK.
Its best not to get involved at all, but the only way to be sure that the person in the photo is the real person, is to insist on using webcam for the conversation.
If she suggests is and gets a no, you know he is hiding something...