Selfie experts say angles can make all the difference. “Even if the lighting isn’t good, holding the camera up a little and down toward you, that’s usually people’s best selfies,” Ms. Andrews said. “It’s very complimentary. It takes height and weight out of the equation. It defines the jaw more because you have to look up more so you’re using your... See more

“Pretend you’re a model, focus on micro-movements and turn your face in 12 different angles,” Ms. Spinelli said. “Go through that set of 250, 300 photos and find the ones you feel confident about and look good to you. I favorite them and constantly recreate those. Those are going to be your poses.”

If you don’t live somewhere that is regularly bathed with sunshine, there are technology-based solutions. “Get an phone case that has a ring light, and then no place is a bad place,” Mr. Morris said.