It is usually less flattering to tilt your head back because your chin becomes more prominent than your eyes. So lower your chin by a fraction of an inch - this will effectively bring your eyes closer to the camera than your chin and mouth and makes your eyes appear bigger.
Remember, just a tiny dose of this trick will do - too much lowering and you might cause a double chin - so use it sparingly and practice in front of the mirror.
More tips to come. Taken from one of my favorite blogs bridaltwist