The document discusses differences between short film and feature film posters through analysis of several example posters. It notes that short film posters tend to provide audiences with an idea of what the film is about, using simpler designs and conventions, while feature film posters give more information about genre to appeal to broader audiences. Full-length posters employ advanced editing techniques and rely more on star power. The document also analyzes conventions used for different film genres like horror, comedy, romance, sci-fi and animated films in posters.