Red is the camera, blue is what you see in the picture

Recovery email only restores access to the account, so you can get future emails. But all data is lost, emails sent in the past (saved emails) are not recovered.

https://proton.me/support/set-account-recovery-methods

Probably “know your customer” selfie. Might be a picture of their ID, a picture of themselves, or a picture with both them and ID.