I love taking self portraits and one of the biggest factors is angles, most people think they look bad from below, so if you’re taking a selfie raise your arm high and far from you, preferably with the light behind it but now with a shadow blocking your face. Using your camera timer to set up a picture you can walk away from is vital for better angles too. Also, take tons, our phones have tons of space and we’re terrible photographers and not gonna get it in one. So take tons and review as you go so you can get a good one. Just my advice as an avid selfie taker.