How many award winning books have you read? These are great reference points for what constitutes not only a good read, but excellent writing. Don’t just read them for enjoyment, study them for what makes them special.
When a book wins an award or is a finalist, the author is given a seal or medallion that recognizes their status, which they place on their book cover. Thus, you can tell by looking at the cover if it’s been given an award. Another way to find them is to go to the websites for the organizations that provide awards. If you don’t know where to find them, here are a few, though there are numerous others: ReadersFavorite.com; BookExcellenceAwards.com; NewAppleAwards.com.
If you think your book is top notch, enter one of these and get a professional opinion. However, bear in mind that as with all reviews, there’s a level of subjectivity. I know one author who got blasted by one of these and awarded the top award for the same book by another. Nonetheless, it does provide a baseline.