Through the Woods by Emily Carroll (2014)
As is typical in horror, the endings aren't crystal clear and they're definitely not neatly tied up with a happy resolution. I didn't always exactly get the ending of these stories, but man, they were creepy. And sometimes it's the not-quite-getting-it that makes it even a little bit creepier because it remains mysterious.
I'm pretty sure I saw a review of this somewhere, but I will fully admit that the primary reason I read it is because of the cover art, which is representative of the vibrant, dramatic illustrations throughout. My favorites were the stunning pictures of the house in "A Lady's Hands Are Cold" (which, isn't that a great title?) I am always impressed by how much can be conveyed by just one picture, and this collection includes many examples of just that.
The graphic novel is a great medium for scary tales and I'd love to find more. I tried Joe Hill's Locke and Key and it was all right, but I didn't love it even though I really enjoy his other work. Do you have any suggestions for scary graphic novels?