Ok, I AM a professional photographer and have been for the past 14 years, NOW is when I'm starting my transition. I've had international awards, have been published.. yada, yada, you get the idea. knowing that I have ALWAYS hated my name since I wanted to be a girl and was born a boy I decided to set up my business with a company name. You can set yourself up as a LLC or limited liability corporation, AND as a sole proprietor. This has several benefits, one being you DO NOT need to file two tax returns and the other AWESOME biggie is that as an LLC YOU can not be sued, only your company. It can really save your ass, as far as your name, tell your clients YOUR name, however you choose to present yourself, but until you legally change it the "business" will have to be under your legal name. Once you have your name legally changed then you can refile the paperwork to have the ownership amended. It sounds complicated but I promise you it isn't. The number one thing is to protect yourself legally. Trust me I feel your pain, I'm looking to finish out my Master Photographer title soon and I'm freaking that I won't be transitioned since I'm not "out" yet, and I'm going to have to have a ton of paper work to change from pro memberships to certifications to competition entries. But now I'm rambling, anyway as far as what a client calls you is up to you! I hope that helps a little. I'd love to see some of your images! What type of work do you do?