A director decides many things about a film’s production in order to capture their vision of what they want their final result to be, through the visuals, symbolism, sound and messages. They tend to have almost complete creative control over the film and many famous directors are considered to have their own unique styles, which is often impacted by the way the film crew work.
I am heavily inspired by Stanley Kubrick, particularly his 1980 psychological horror The Shining, which uses concepts of liminal spaces and isolation to build a truly maddening, horrifying film that shows a mans gradual descent into complete psychosis in an eerie, breath-taking manner.