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It sounds like your essay will work very well with your chosen texts, but I was wondering if four could be too many unless it is a dissertation or something nearly as large. Funny you should mention the mirror theme in relation to Dorian Gray, the subject was on my shortlist for my dissertation, but I have gone for something else in the end.
Mirrors are always significant in literature, but especially so in Victorian literature with the influence of the gothic. I would recommend reading around the gothic motif of the double which is obviously carried over strongly in both Hyde and Dorian Gray. Narcissism as someone pointed out, is definitely worth looking into as well, you will certainly find joy there in terms of Wilde’s work.
As I said reflection via the mirror is something which you can argue pretty solidly for a great deal of literature. The mirror reflects the world depicted – literally as it were – in the text. You know holding a mirror up to the world and reflecting its ills, whether you argue as a conscious deployment on behalf of the author or as a subconscious Freudian element, it could work either way.
There really is a lot to go on when you consider the portrait as a mirror image, Hyde as Jekyll’s inverted reflection, and Alice in Through the Looking Glass, and maybe the poem, so it could be too many texts if the word count is not that high, you don’t want to stretch your argument too thin.
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It could have something to do with one's role in society (how others view one as one sees oneself in the mirror) and one's awareness of that (does one recognise oneself or not).
It at least seemed like that in Jane Eyre. The only problem with tht is that Nietzsche's (?) theory was developed after that book. But I suppose tht what is there is there and is identifed later...