The scammers start by stealing a photo from an internet site.
They prefer to use images of white people capitalising on stereotypes and perceptions.
They often pretend to be foreign specialists [from the US, UK or Canada, but can be any European country]temporarily working in Nigeria or other African country.
A slight twist is is when the scammer pretends to live in the same country as the victim, and once a relationship has developed, then advise they are required to go to a west African country on an assignment.
The reasons for needing the money will sound plausible.