Although you can use the score sheets, there's no guarantee they will help. I appreciate it when the judges make specific comments on the sheets (e.g., location of a fabric wrinkle or rust fleck), but not all do. So they might just deduct for cleanliness without giving any indication.
But there's another option too. At my first concours, I approached the chief judge and asked if it was permissible for me to speak with the team that judged my car (after they completed judging, of course!) to ask for feedback. So when the time came, I approached members of my team and asked for a harda*s evaluation of my Jaguar, making it clear that I want to learn more so I could improve her condition -- not that I wanted to engage in any quibbles. They were incredibly helpful!
But, of course, you'll want to be sensitive to the "tone" of the event. I'm learning (with just one year of Jaguar concours under my belt) that some clubs are quite formal and "by-the-book," while others are quite relaxed.