Are questions about the identification and analysis of film themes on-topic at English.SE, or would they be better suited for Movies.SE?
You might want to ask on Movies. As it says on their help page:
What topics can I ask about here?
If your question generally covers …
- Analysis of content or theme of all forms of Movies and TV series
That said, I'd be careful about copying questions from your class verbatim into a question, and seeing what others think. That kind of question smacks of "homework help," which is generally regarded with disdain across the Stack Exchange.
However, if you take a cut at answering the question, and you're asking for help on some smaller part of it, I think that might be your best place to start.