Again this month there aren't many new books about royalty, but I think most of the new books' covers are pretty good. My favorite is this one:
The Meiji Restoration by Alistair Swale tells how real imperial rule was restored in Japan in 1867 under Emperor Meiji. I think this cover is colorful and unusual, and gives you a bit of a feeling for the times. I can't help noticing the man with the flamboyant mustache and his debonair friend. The emperor seems disgruntled with them both. A cover that makes you start imagining storylines is a good cover, I think.