Words or pictures: you're certainly free to chose your precedence of course. One could also argue that JRRTs thoughts in his letters here represent his musings, but while a book cover would take some doing, and be rather 'public' to boot, he did some more thinking on it ~ not that I'm arguing that
As to your question, it depends on how one looks at the significance of the various towers with respect to what the title itself might "represent" (ie what is desired). Tolkien himself seemed to vacillate as we see ... and even the letter you cite follows with: "But since there is so much made of the basic opposition of the Dark Tower and Minas Tirith, that seems very misleading." ~ the early sketch seems to pick up there interestingly.
~ but heck, afterall, a picture might be worth a thousand somethings
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