If you want to brighten up your appearance naturally you can do it with face yoga! Here are some great 'face yoga' examples you can do wherever you are;
The Cheek Lifter: Open your mouth to form an “O,” and position your upper lip over teeth. Then with your mouth open in that "O" lift the top of your cheeks towards your eyes. Sort of like cheek crunches. Do that about 30 times and then hold for 10 seconds. You'll really feel the circulation going and studies show that face exercises actually work.