What is the approximate distance between the camera and the characters when shooting these pictures?

Generally speaking, if your shooting location is not limited, the camera should be as close to the subject as possible, which can effectively prevent your lens from shaking and make people stand out from the background and foreground interlocutors (the foreground interlocutors can also be highly blurred)-you can only use the over-the-shoulder lens method to express it, and the lens is 50-80CM away from the subject, and realize the illusion of the foreground interlocutors by manually focusing the camera.