Further Research on Conventions within a Thriller Film:-

A scene that is thrilling and eerie will more than likely use lighting of dark colours so it creates that edgy gut feeling of something about to happen. This intrigues the audience and makes them want to know more about what is going to happen in the film. Also lighting of the colour red is another convention that symbolises death, blood and violence. This in a way foreshadows the film as a thriller.
Sounds also lets the audience know its a thriller and a way to show the intensity of a thriller is by having sounds of a loud heart beating, loud breathing etc. This makes the film seem more realistic, and makes the audience extremely and utterly intriuged and at the edge of their seat in suspense.
Another Convention is a vulnerable female protagonist being chased by a dominant/scary male. This is used in many films (e.g. Prom Night)