1. What is your style? Make sure you are on the same page by determining this. The various photographic styles include: fashion, lifestyle, portrait, contemporary and documentary.
2. Do you have a portfolio I can see? This is the best indication of the photographers style and retouching capabilities.
3. Do you have a reference list? If you would like additional reviews of past work the photographer has done, this is a good way to learn even more about them.