Watch the entire movie and choose the scene you wish to analyze. Pick something with an analyzable theme.
Focus on the scene you have chosen. Watch it a few times in a row.
Take notes on the scene. Study the way the characters interact and what that says about each character. Dissect the choice of camera angles and the scene's setting and overall purpose.
Formulate a hypothesis based on a fact you want to prove about the scene you chose.
Write an introductory paragraph stating your hypothesis as well as the relationship of this scene to the rest of the film.
Formulate three supporting paragraphs. Each one should bring to light a different point to prove your theory. Include quotes to strengthen your analysis.
Summarize the scene analysis in a conclusion paragraph. Tie together your points with the hypothesis and the theme of the film you have focused on.