you might also want to think about the striking simillarities of Rowling's Harry Potter books, especially the Characters (and some Plot Themes), if you need or want to show direct examples of Author's being influenced (or downright copying) Tolkien's works.
for example Lord Voldemort = Sauron. The main 'baddie' had almost been defeated in the Past, and is slowly coming back to power, trying to take the world over again.
Also, in my humble opinion, the ending of Pullman's Dark Material's trilogy was a direct copy of the Gray Havens scenes of LOTR. (I state this one as Pullman seems to have been quoted in the Press to be somewhat disdainful of LOTR, and then he goes and copies the ending!)
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