What should I do after accidentally sending my passport picture to a scammer?

Perhaps advice from the police where you currently are and/or in Canada and possibly a new passport.

I really wouldn't worry too much about it. Canada is likely to have identity checks so if someone else uses your details to get a job, the fraud will be discovered. Not likely people will try something like that in Canada. The probability of you and some fraudster applying for same job in the same country are very slim.

However, you will want to get official record, police report or similar. Getting a new passport maybe a good idea.

One issue that may arise, if the fraudster gains employment in the same country as you, then you may have financial troubles, taxes, credit etc.

If you have documentation that you reported your identity things were mishandled (police report, new passport) it maybe useful in the unlikely event you will have to prove your identity information was mishandled.

But ultimately the world is a big place with many people the likelihood you will cross paths with the fraudster is slim.

Fuck them Casey