Elements I do want to see:
A standing stone with a triskele carved in it. The Triskele is the symbol of the series as a whole. As for the Triskele shape the series is using a shorter spiral design so please don't use a very long spiral triskele. I prefer a low light setting such as nighttime or in a forest rather than bright light as most of the action of the story takes place at night.
The narrative of the story is around the conflict between two worlds with humans on one side. Their color scheme tends towards earthly colors, iron gray and blue. Feel free to be creative within that color scheme. Their enemies have violet eyes so be more cautious with that color.
Please avoid relying on stock images. I prefer covers that look more like they were painted and less computer generated. Covers I like usually have a lot of texture and details. For example I like: the cover of the Nights of Villjamur, the Mists of Avalon covers, the Wheel of Time Covers, Glen Cook's Chronicles of the Dread Empire books, covers for Brandon Sanderson and Tad Williams books. I like the feel of high fantasy.
Elements I don’t want to see:
The heroes. I haven’t told you much about the heroes because to be frank I don’t want to see them on the cover. The series has a lot of characters spread over two different time periods so I’m not looking for a main character cover.
Potential Elements from the books:
The villains of the series are the Sídhe, an old Irish variation on fairies. They are human sized, slim built with very pale skin, white hair, highly refined features, violet eyes and small horns out of their heads. Those that encounter the heroes wear golden armor. The secondary villains are their hounds which are silvery very slim hounds like greyhounds with upright ears. They are gray in color and have violet eyes like their handlers. Should you be interested in using the villains as part of the cover please keep them secondary with the standing stone as the focus. Also should you chose to use these elements be aware that the villains do not come out during the day.