I also couldn't tell whether your second book was titled "Schattenjager" or "Echattenjager."
That might not be worthy of complaint, however.*
Your gold text on the light blue background isn't really working for me, particularly where the folds in the satin (the lighter blue sections) have a tendency to wash out the detail on your calligraphy "S" in "School."
In images 2 and 3, we've lost the detail in the crest on the sword blade. It used to be an eagle, and now it's kind of a blurry purple shape. You've also just about lost the fuller on the blade, as well.
All in all, I'd say I like #1 the best - doubly so if you can fix the "S" issue I mentioned above.
EDIT, To add:
* - Other than that minor issue, I really, really like your second cover. It's black. It's red. It's probably got Nazi zombies. It communicates that extremely well and with extreme simplicity. Well done!