The cover could either have an object (Fifty shades has a tie) or an image of a very attractive red-headed lady in a submissive pose (kneeling or handcuffed). Covers that you should look at for ideas (on Amazon) are;
The Diary of a Submissive: A True Story
With This Collar (Mastered)
At His Command: Dominated by the Billionaire #1
The Bride Stripped Bare: Novel
Entwined With You (Crossfire, Book 3)
It needs to be attractive to women and look 'classy' and 'elegant' as well as sexy and sophisticated.
Its an Amazon kindle cover for an erotic novel aimed at women.
The central character is a young (28 year old) very beautiful red headed lady who is submissive.
The Title is
Twenty Tone of Red
The author is Pauline Montford