Hi Mike, the image really does work for a book cover! There would be so many options to colour pic out of the image for the text. What colour would you imagine the text to be if picked from your cover?
If you had to go with a press that gives you pre-designed book covers like the Pivot range, what colours and patterns would you go for, what 3-4 keywords would help you to make that decision? Here are some already published: https://www.palgrave.com/gp/campaigns/palgrave-pivot