if i really need to choose, it will be advertising at bridal websites.
however having said that, i dont think there is one best method but rather there should be a combination of 3 methods:
1. firstly, advertising to reach out to new clients, most effective way with self-selection will be at bridal websites and magazines.
2. secondly, once the audience is aware of your presence, you will need a medium to showcase your portfolio i.e. website or blog.
3. lastly any affirmation of your work by their friends i.e. word of mouth will definitely seal the deal.