Very interesting story, I had a good time reading it. Based on a little googling, it seems rather faithful to the Irish mythology, though I'm sure there are many variations of this legend.
I think the dialogues could have been a bit more refined, bringing more substance to the events described.
I'm not saying it should have been dialogue-heavy as From Hell, but I felt the pages were turning too fast.
In my opinion, as opposed to other graphic novels (Habib, Amerocan Gods, The Sculptor, to name a few), the illustrations are not as enticing not detailed; so, with little dialogue, I found myself going through this very fast and not enjoying it as much.
Good, but could have been better.