Wicked Lovely by Melissa Marr
This book cover has always been one of my absolute favorites. It's one of those books that's been on my shelf forever and I just fall in love with the cover every time I pick it up. I love the detail of the frost on her hands, and the blurred effect of her face in the background. I like that you can still see the expression on her face, but that her hands with the flower are the central point of the cover.
I just think everything about it is so artistic and beautiful!