Now for some interesting cover comparisons. These four covers grace the first two book in the Firelight series by Sophie Jordan. The top two are the US covers. I think the girl on Firelight (Goodreads) is supposed to be the heroine, Jacinda. If that theory holds true, then the cover on Vanished (Review here) is her twin sister Tamra. They look different because they have such contrary powers. Jacinda is a fire-breather, while Tamra is a Shader - simply put, a draki mist and fog generator.
And now for something completely different. This cover was used on the Indonesian version. I thought that was interesting. But does it 'speak' to me? Not really. I would not have bought the book based on this. What about you?