Students should be engaged in their own learning:
The easiest route is for an instructor, or tutor, or consultant to take the lead. You are viewed as the expert, and students may not be able to assess writing well enough to know what to focus on: they don’t have the vocabulary to ask the right questions.
In such a circumstance, you can model for students appropriate questions to ask, or guide them towards such questions.
What do you think you’ve done well? Tell me why you think you’ve done it well. What have you most struggled over? Why do you think you are...