Not evil as Mordor) Actually there will be some characters you can tell they are "evil" But they will have they own truth and goals to achieve. I think Windhall empire is more like a high organized military structure.
I bet I am one of the few people who can see where you drew inspiration from. On the left would be an imperial storm trooper with the white helmet. On the right would be the blood guard or guards of the Emperor in red. Star wars. Very cool and subtle. I like it.