When it comes to smiling for pictures, the worst offense is flashing a jack-o-lantern: all teeth, no eyes. In order for your smile to look authentic, you've got to bring your eyes into it and give what is called a Duchenne smile. A true Duchenne smile is naturally authentic, since it's very difficult to engage the muscles around the eyes unless you truly have something to smile about.  Check out the difference in the mirror. Do you see how much less happy you look when your eyes aren't engaged? When you're smiling for a picture, pretend like you're smiling at someone you love. Your eyes will crinkle convincingly and your smile will look authentically beautiful. It's not necessary to give a big, toothy grin, but showing some teeth in your smile will brighten your face. Try showing just your upper teeth, rather than smiling so big that all of your teeth are exposed. If you prefer a close-mouthed smile, that's fine - just know that you'll probably look more serious than everyone else in the picture. Facing the camera head-on isn't the most flattering pose for most people. It flattens your features and can cause you to look a bit distorted in the photograph. Instead, show off your pretty bone structure by turning your head slightly to one side. If you have what you would consider a "good" side - a side that makes your features look finer - bare that side to the camera.  While angling your face can make your picture look more flattering, it can also look contrived if you overdo it. Make sure your face is tilted at what looks like a natural angle. If possible, stand a bit below the camera, so that it's pointing slightly down at you instead of pointing up. If you tuck in your chin, the shape of your face will look distorted. If you tilt your head up and stick your chin out, it'll look like you're trying to hide a double chin. The most natural position for your face is to hold it level with the camera, as though you were going to have a conversation with it. " Photographers love to tell their subjects to say...

How would you rephrase that briefly using Vietnamese?
Cười bằng mắt. Để lộ răng. Tìm góc đẹp nhất của bạn. Đưa mặt ngang tầm với máy ảnh. Nói một từ có âm cuối là "uh".