Thank you so much for the speedy reply!

I've been a silent observer on the forums for months haha (too ashamed to post after I forgot to thank Elyse for responding to a question I asked in the legal studies thread

)
In reference to the last part of your answer, I was wondering if you could check the analysis here:
Before:
During his pursuit, he discovers Kurtz’s true nature manifested in the form of shrunken heads. The provocativeness of this discovery is represented through an idiom: “These round knobs were not ornamental but symbolic; they were expressive and puzzling, striking and disturbing -- food for thought”. The idiom “food for thought” conveys the fact that the Marlow feels conflicted and provoked by this unexpected discovery.
After:
Conrad represents the provocative nature of Marlow's discovery through the idiom "food for thought", effectively conveying a confronting image to the audience as they too discover the confronting nature of imperialism. (I'd probably reincorporate the whole striking/disturbing part to reinforce that it's confronting).
I'm concerned that I rely too much on retell. I'm also unsure about how to rely less on the character/plot and more on the concept.
I had one more question as well:
I know that the markers like to see a variety of techniques. Would it look bad to refer to a technique (e.g a metaphor) more than once in an essay? In times when I have done this, I usually tie in another technique with the metaphor (e.g. a metaphor and auditory imagery). Would it be better to omit the metaphor entirely or is it fine as long as other techniques are added?