In hairstyle terms, that means avoid high-volume 'dos like bouffants and mohawks! What you can do is sport a simple style that will add some width to your face. Some short 'dos look amazing on long faces, especially if they are asymmetrical, however if you like your hair longer, check out the supermodel style on Nicole Trunfio. This hairstyle is classy, sophisticated, and looks fabulous on a long face.
Nicole's cut is simple so it's easy for your stylist to copy. Ask for your hair to be cut on a deep side part and with a cheekbone-length side-swept fringe. Also note that you'd like your layers to start mid-length so you can style a lot of volume into the ends.
This style looks fabulous when styled straight and sleek (use a flat iron for dramatic results) or with some bouncy curls added. To get Nicole's style, use a curling wand to create natural-looking loose curls, and then sweep it over to one shoulder. You can let it sit loose, or secure it at the nape of the neck if you want it to stay in place all day and night.