When you describe your face shape as narrow, I am assuming that you mean that you have a long face shape. If that's the case, to create the illusion of width on a long-shaped face, apply blush to the apples of your cheeks and extend the color outward towards your ears. Next, sweep your blush across the middle of your forehead and along your chin line. Just remember when working with blush, a lighter application is more attractive.
I hope this helps you.