When finishing the first draft some people have found that the rewrite means they have to pare down their story. Most first time writers are assumed to have this problem and I have heard suggestions of taking out up to 20% of the excess. This has to do with overwriting. There was a time when a writer could fill pages with description without the reader complaining. Now the story needs to move along at a good pace and not be slowed down by too much description.
The opposite end of things some writers need to rewrite things in such a way as they add to the story. The story is too concise and the writer needs to add more to it to help the reader be in the story. Sometimes this means adding things like description because the writer leaves much of it out.
Both these require the writer to know enough about their style to know which they have to do when they get that far in their piece. Sometimes this is evident and other times it helps to have a beta reader.