First drafts tend to be unbalanced, depending on your style. They may have too much or too little of certain elements. For example, many authors, myself included, tend to focus on action and dialog. These are great for keeping a story moving, but the reader isn’t likely to “see” the story in their head or feel much empathy for the characters.
To remedy this, for your second draft, start by checking how your IDEAS are presented, where IDEAS is an acronym for Imagery; Dialog; Emotion; Action; Suspense. Examine each scene to determine if you need to add something to round it out. You don’t want to slow down heavy action with too much detail, but get enough in there so the reader can visualize it. Setting up the location beforehand is one way to handle that, so the reader already has a mental image for the action to occur.