Craigslist scams romance and dating scams
Scammers may try to handwave this away by claiming to be of mixed race. Did they start referring to you as their wife/husband and to their child (if they claim to have one) as "our" daughter/son?
As well as in their profiles, scammers can use stolen text in their replies and emails to you. This is to increase the "bond" you have with them and make you more willing to send them money when the "emergency" arises.
There are several image search sites online that you can use to try and identify who the person in the photos really is such as Google image search or Tineye.
Firstly, no single sign should be treated as 100% proof the person is a scammer.
Before we move on to the tactics used by scammers if they're already talking to someone, it's worth pointing out another form of scam where the scammer actually meets the person.
The scam in this case is that they expect or even demand the person buy them expensive items and take them to the most expensive places to eat and drink. will be inflated in price, with the female splitting the difference with her accomplices at a later date.
If you're a hopeless romantic, they'll use that, but if you talk about wanting children, that's the crack in your armour they'll attack.
Do the emails include your name too many times to feel natural?