First, try not to take the whole face when taking selfies.
I believe everyone knows one thing, that is, if you take a selfie with the whole camera facing your face, your face will look very big to a certain extent, so what should you do at this time? Try not to pat the whole face. You can take half a face.
This will make your face look smaller. If your face is really big, it is basically impossible for you to shoot the whole face. So, try to put half of your face, or this 1/4 face, which will look better.
Second, when taking selfies, try to cover your round face with gestures.
In fact, taking selfies with your face will make your face look rounder and fatter to some extent, so why not show your big round face? Just make some gestures properly. You don't have to face the camera completely. You can make a gesture, such as comparison.
Then, put this finger on your face to cover your big round face to some extent. This is a very good way to take pictures. Don't take selfies easily when taking pictures. Since you have chosen to take a selfie, you should modify your face.
Third, try to add some small expressions.
When I take a selfie with my face, I think I can add some small expressions appropriately, which will make you look more vivid. If your face is round, you can pout and look cute, so others won't think your face is big or round. This is also a good idea.