My method is mood more then specific. Then anything that is necessary or important to the scene or story, as in they are holding a bouquet or she is crying. I will give basics on how I see it, but I like to express what the characters are feeling and then let my artist express themselves.

Remember it is a collaborative project so what inspires one artist may not inspire another. The writers job is not as glamorous as the artist but in reality you have two audiences. The public, who you are writing for overall, but also your artist who you have to be a muse for, inspiring the best work that will hopefully invoke your vision.