Brightening your eyes is easy with a little bit of know-how. There are two different ways to brighten your eyes with shadow. One is applying a light shadow to the center of your lids. This will give you a three-dimensional effect. Applying a light shadow to the inner corners will also make you look more bright-eyed. One last trick is to use a light cream-colored eyeliner pencil and draw along the bottom tear line of your eyes.