The main issue with your essay is that you do not give enough analysis of your points or offer any evidence to support your claims. Always follow the structure: make a point (about lighting, character, plot etc) – explore the point (analyse: what is happening/what is it about/what does it tell us) – support the point (evidence: give examples from the movie, show pictures, give a quote from the movie and/or the director and/or actor and/or film critic) – evaluate the point (give your opinion).