If you're not aware of this series it's a powerful tale of war, revolution and magic; of long lost princes and fairytales. It is in my opinion one of the best fantasy series' out there, and it has three gorgeous matching covers I'm going to explore. Very minor spoilers ahead, though very general.
I also love the detail of the lead characters trapped in the bottles, emphasising how they are almost bound, in one way or another, to these mystical properties around them, and also the fight they must endure to break free and win the war they are inherently part of. On further inspection I also realised the covers 'reveal' the main protagonist of each story.
Book two is Errin's story, shown by the girl being dark haired and surrounded by plant life, while 1 and 3 (though Errin does feature heavily in 3) are Twylla's, shown by her red hair and the streaks (1) and drops (3) of blood surrounding her. I thought that was a pretty cool way of keying the audience into each book's main POV.
I also love the colours used, both in the choice of colour but also their vibrancy. To me, the green of book 1 signifies poison, which the book utilises quite heavily, while the blue of 2 signifies blue sky - the parting of clouds - and therefore perhaps hope? Finally the gold-yellow of three signifies not just loyalty (As in Queen) but also victory. The vibrancy also highlights the rich story, world and prose beneath.
Lastly I love the font used for the titles, a rich cursive that I think represents the fantasy genre and 'royalty' aspects of the series, but also in the masterful stroke of each letter represents the equally masterful storytelling each book contains.
If you haven't read The Sin Eater's Daughter trilogy, I really do urge you to do so.
As always, thanks for reading. I do hope you enjoyed my thoughts on these covers. Do feel free to leave a comment below or @ me on Twitter with any thoughts.