This is a fair question, as making it clear what you want can be a difficult task.
Many clients have no clue what they’re looking for, while others have an exact image in mind. In any case, it’s always hard for them to express to a designer just exactly what they want. Communication is definitely key, and the website’s detail will depend on what information the client gives me.
If desired, I have a website questionnaire that can be filled out, giving us both a better understanding. I will also always describe what I’m doing by sending screenshots of color schemes and layout styles.
Rest assured, you will always have a chance to change details before I’m ultimately finished.