Getting quality photos starts with hiring a quality photographer. To find one, ask for recommendations from your fellow models, casting agents or other professionals in the industry. If you've seen other models' photos that you like, ask who shot them. You might also do an online search for "fashion photographer" in your area, but make sure the person has experience shooting modeling photos. Look through the photographer's website and portfolio to ensure you like the person's style.
A sought-after photographer may cost several hundred dollars -- or more -- for a short session of one or two hours. If you can't afford the fee, check art colleges or schools of photography for student photographers who may be willing to work for less, or offer a work-trade -- perhaps working as a photo assistant for a few days in exchange for photos.