In the drafting process we develop the principal idea or theme of our writing, we use a sequence in a clear and effective way, and we use words appropriate for the topic we chose. So, the main parts of it are (from the ones listed):
Word choice: the use of rich, lively, detailed language that moves and informs the reader.
Ideas: the mood of the message, the content of the writing, the key theme, together with the details that improve and develop that theme.