Iron Giant; Sci-Fi.

The opening sequence for the film helps set up the premise, something crashes into the sea while a lone fisherman in a storm frantically looks for a lighthouse. The crashed object turns out to be a giant robot, with the fisherman looking on in terror as he crashes into the robot.
The robot is heavily stylised to keep the film child friendly, with larger white eyes, and with a metal mouth that always seems to be in a smile.
This means that he can strike a scary figure against the dark or when partially obscured but once the main character, Hogarth, a young boy in suburban 50's America, meets the giant he comes across as naive but friendly.
The mise-en-scene helps set the scene with 50's American vehicles, a small town setting and lush woodland areas.
The introduction of the government agent Kent Mansley is introduced as an incompetent antagonist, who looks down on the small town and the population there not taking the giant seriously until he himself witnesses it.
The giant also becomes frightening whenever he notices a weapon as a defensive action. When threatened his eyes become smaller and red, with tentacle guns, chest cannons and blasters on his arms, a very relevant throwback to cold-war robots.
The costumes in the film are very heavily 50's stylised, with the Hogarth's mother, Annie Hughes, wearing a pink dress with white collars in a diner.
The film has a lot of colour, with bright greens for the grass and foliage, deep blues for the sea.

Above is a trailer for the film; The Iron Giant.