>>39927761- Look the person in the eyes, not only through the camera
2- Don't take a photo of someone too sketchy unless they're doing something and not paying attention to you
3- You can always ask for permission if they look open to it
4- Frame the subjects in the environment, so you can claim you're taking a picture of the surroundings, not them specifically
Exemple, guy is open to it, yet is also doing something, he'd have soon forgotten his picture was taken