Noir has been known for the usage of low angle shots, wind angle lenses, and it's dutch angles. Many shots can include people in mirrors, or shots through glass.
Femme Fetale
The females are very typical in film noir they were either of two types - loveing, honest, trustworthy women or femmes fatales - mysterious, duplicitous, double-crossing, gorgeous, unloving, predatory, tough-sweet, unreliable, irresponsible, manipulative and desperate women. Usually, the male protagonist in film noir wished to elude his mysterious past, and had to choose what path to take.
Invariably, the choice would be an overly ambitious one, to follow the dangerous but desirable wishes. Leading to the self-destructive femmefatale who would lead the struggling, disillusioned, and doomed hero into committing murder or some other crime of passion coupled with twisted love.