Mise-en-Scene is a critical term (i.e., we use it when analysing film, not really when making film) which basically means 'everything in the shot.' It can refer to the setting, the costumes, the iconography, the casting, the facial expressions, the lighting, the camera angle and movement... everything. the basic idea is that all of these elements should be controlled and all of them should be working in unison to create the desired effect.