This is such a worthwhile thing to start doing. Conceal under your eye in a triangle shape. Your makeup will look more blended and you’ll achieve that more flawless look. Plus, it won’t show up as harshly in flash photography (if your concealer has SPF or just isn’t great with flash). I do this every single time I do concealer even if that’s all I’m putting on that day. I know so many people that do what is done on the right (concealing just right under the eye) and let me tell you it doesn’t look that great.