Conventions of Film Noir

Film noir used throughout the thriller genre is split into 4 main sections; Camera work, Themes/Mood, Characters and Mise-en-scene.
Camera work
All thriller movies are to include; obscure shots an example of this can be the camera in the point of view of someone spying, Extreme angles, these can be extreme high and low shots. An example can be seen below of an extreme angle in James Bond.

Compose space between characters, this is used to show suspicion and distance and CU/ECU of emotional response.
Themes/Mood
Thriller films are seen to be very dark and have a lot of enigma. Status is used a lot to symbolise which characters dominate the others; crime, betrayal, lust, discovery and bleak are shown as major moods throughout thrillers.
Characters 
All thrillers include the same characters in film; Detectives, Business men, Cops, Suspects, Gangsters (shady people) and Pretty girls (Damsels, Femme Fatale and Love interests). An example of femme fatale, Lana Turner is seen below.

Mise-en-scene
Mise-en-scene meaning everything within the scene, can be split up into 4 sections; Props, Sets/Locations, Lighting and Costume.
Two main props used in thriller are guns and cigarettes; these have been used since the beginning of the genre.
Sets/Location used are: Staircases, Lampposts, Alley, Bridges and very claustrophobic areas to add to the tension of the scene.
Lighting in thriller is very dark, usually there is a single source of light in the scene and its very artificial and harsh light, strong shadows are projected, this is used a lot on staircase scenes and there is a flood light projecting over the characters.

Costumes include a suit, this is usually for the detective like character, this outfit would also include a hat and the women are likely to be old glamour this includes a lot of dresses and furs.