Light is ALWAYS your friend in pictures. Sure, there’s editing to make the picture look like really professional lighting, but for a more natural look try looking up into the sun or whatever light source is near you with the camera lens facing you. Tilting your arm up at about a 45 degree angle and looking up into the camera creates more angles and flattering shadows to your face. The “spotlight effect” can blur pores, blemishes, diffuse dark circles and create bones you never knew you had in your face. This is how a lot of “ulzzangs” or cute korean models take a lot of their pictures to make themselves look like they have more chiseled features and bigger eyes.
The above picture hasnt been retouched at all. It was taken with my 3.0 megapixel phone camera. The natural light I used in the photo actually did a lot of retouching for me because the light camoflaged a lot of the flaws on my skin. Light can be tricky when it’s too bright because they increase gamma levels which are the weird bright white patches on my cheeks and nose because either my skin was too light or the sunlight might have been too bright.
Hope that gives a few tips on sel-cas! And also a little insight to those that see those weirdos waving cameras in the air craning their necks to take a picture haha.