Here's a thought, contact brokerage offices and ask if you can bring breakfast to their monthly(or weekly) office meeting. Many offices hold a regular office meeting and you could get an opportunity to speak with the agents of the office at the meeting if you are the breakfast sponsor. A similar opportunity to meet Realtors is at the area real estate schools. Designation courses and license renewal courses are opportunities to sponsor the breakfast or lunch or afternoon snack for the course attendees, and get an opportunity to speak with the group about your photography services. Offer more than just your services, include a "best photo tips" page as a freebie, or any other useful list of tips you can give that would be helpful to the audience. Hope this helps. Good luck!!
Michel, that's awesome, I hope that works well for you! Under the "Tools" button at the top of your HAR.com page you'll see a link that says "Service Directory," you can place your business under the marketing section of this great REALTOR tool, and they will be able to see you and contact you! Hope this helps and I wish you SUCCESS!!!!