Hey, I've been unexpectedly entangled in other activities so I haven't been able to fully write up an essay. All I will say is that if you keep in mind how the colours in the scene reflect the characters and story, then that should help. In The Big Lebowski (I don't know if you've seen it but I'll explain) The Dude's bathroom is adorned with bright pinkish features and wallpaper, and this coincides with his hippie-like ideals and his care-free personality. The henchmen who break into his house are veiled in shadow showing that they are threat to his zen, and the other hostile characters including the narcissists wear black clothing because they're very negative and don't believe in anything.
I hope what I've said gives you some insight here, but sorry for not getting a proper paper done. I didn't know your mock was imminent. Anyway, best of luck and I hope you do well in this mock, but don't worry if you don't because mocks are assessments of progress and trajectory, the real exam is the one that you should give your all too-so long as exams don't stress you out and you don't feel pressured.