Many magazines reach specialized audiences. Placing an ad, though expensive, in the right magazine may be all the advertising you ever need to do. There are local, regional and national magazines. Many offer both classified and display ads as with newspapers Portfolio. Put together a collection of your best work.
Many people take photographs of every project.
Include letters from satisfied customers. Display at shows. If you're in the craft business, this may be a must. Only attend the shows that will bring you the type of business you want. One quilter uses this as her only means of advertising.