Yes, we used a model with a green screen and those were a couple of the shots we used. One of the intentions is to use the same model for book 2 and 3. So by not showing a face, I can get away with that by changing the outfit and hair with a wig. The Jungle ruin is a stock photo that I purchased rights too.
In photoshop when reduced to a thumbnail, the yellow Requiem stands out a lot, The Eternal Gateway and the author title pretty much disappear.
The outfit is different from the front and back options as we ended up with over 170 shots and about 15 of them were singled out to choose from.
I haven't seen any back covers for eBooks when I browsed Amazon's web site. I intend to have a print version as well.
The posture was hard to get. When we had her pose it looked awful. So we had her walk a path and then spin and stab/slice a target to her right to get a more natural movement look and shot. It worked out quite well actually compared to some of the other shots.
Here is a re-sized 120 pixel thumbnail