If you want to become an advanced reviewer, I recommend you sign up to go through the mentoring program. It will help you write more detailed, better reviews, and to know what others look for when reading a review.
Even advanced reviewers can get a mentor. I'm planning on working out an agreement with my current mentor (or finding somebody else) to keep watching over me once I get advanced. Most of it is because I'm a foreigner and managed to write "circumference" when I meant "diameter" in my first review (and then complain that the toy is a bit too wide ), but some of it is just wanting to have another person's perspective.