Word of Mouth happens faster if you help it along.
Make sure you always have plenty of business cards, and that you ask your customers to give some to their friends and recommend your work.
here is a little strategy that works wonders:
Write a page with what you want to make sure every customer knows about your service using your own words. Then use it a s guideline and PRACTICE your pitch so it sound good, once you have it down use that pitch as your message on your voicemail and ask people to leave their name, number and what service they are interested on.
That will help you make sure everyone who calls hears what you offer and helps you make sure that anyone who leaves a message is already a prospect and not just a "tire kicker".
Good luck