Self Publishing Author needs an engaging Book Cover Design for fantasy story

This is what a business in United Kingdom was looking for in their graphic design

Father of Storms by Dean Jones
Book cover should reflect the fantasy genre the story is based.
Seth (the main character) is a mid 30's man who is battle hardened and has long hair and well kept beard.
A scene in the book that may suit for imagery is where he ties the priest who led the village to kill Seth's wife to a tree beside his church and makes him watch as the village is slaughtered by Seth with his sword & the lightning he brings down on the church and houses.
The mara are key to Seth's story and are twin demons with pixie features and hooded cloaks.

I would like realistic imagery with combination of energy / lightning usage and intense characterisation of Seth. Read more