These actually look like book covers, but they’re not, they are movie posters. Flickr User Traumatron Illustration form UK is the person behind them. He is drawing the movie posters with probably darkness as inspirations.
Because they are dark and raw, just like the covers of horror or fantasy books that you can find in the library. The movies that are represented are The Shining, Black Swan, The Girl With The Dragon Tattoo, and many others very known films.
If you take a closer look at these movie posters, you will notice how scary the characters are, more scary than in the actual movies. The “All work and no play makes Jack a dull boy” is working its creepiness. Some other amazing posters of famous movies are these minimalist ones.