Mama (2013). I like this movie because it has a good story. The children are wild and creepy. Even though the special effects are not the best in the world, the story more than makes up for it. The dynamics between the girls and the ghost "Mama" are very interesting. Also, I like that it does not have a predictable ending.
One Missed Call - a horror poster example. Check out Filmsourcing tutorial on how to create a horror movie poster in five steps. http://www.filmsourcing.com/blog/2013/creating-a-horror-poster-tutorial/
"Dark Skies" - As the Barret family's peaceful suburban life is rocked by an escalating series of disturbing events, they come to learn that a terrifying and deadly force is after them. This is a really, really good movie. With Keri Russell, who's always amazing. Image and info credit: IMDb.