What makes a good psychological thriller?

Due to the initial viewings of psychological thrillers in class and from my own knowledge of films, a good psychological thriller is made up of many different aspects, such as tension (a build up of tension to get the audience questioning themselves), suspense (a build up of suspense to get the audience questioning themselves), keeping the audience questioning what will happen next (which keeps the audience on the edge of their seats), realistic settings (to create a sense of realism), not giving too much away to the audience (to keep the audience watching throughout the duration of the film), and most importantly, main and complex characters (to help the film flow, and keep the audience questioning what the characters will do next and throughout the film).