The cover should look professional and enticing, but it should also work with the subject matter of the book. (bookpublishingriches.com)
There is a good chance that if a hiring manager receives an email with no subject line, they'll delete it without even bothering to open it. (thebalance.com)
For a book that deals with the subject of love, there's surprisingly little warmth or compassion in its tone. (itunes.apple.com)