Donna’s answer to “Wow! Your dragon books always have the men without faces so we can picture them any way we want to,…” > Likes and Comments

I believe there is an age-old adage, "never judge a book based on its cover".

The common saying and English idiom don't judge a book by its cover or can't judge a book by its cover means that you shouldn't form an opinion about a person, place, or thing just by looking at their or its outside appearance.