Marketing is crucial for any business, and you don't always need to fork over hundreds or thousands to promote your brand. Forget SEO (search engine optimization) that these companies are repetitively ramming at you, or Google and Facebook ads. As cliche as it sounds- the best marketing is word of mouth. For every wedding or engagement shoot or portrait session you photograph, you are widening your audience to newer clients automatically. The key part is leaving an impression. If you go out there and are professional, yet easy to get along with, and have great work- you should be set. You want your clients to rave about you. If they truly love your work, they will tell their friends, and those friends become clients who will refer you to their friends.