A good title is not too vague, yet not too long either. A good way to think about it is, if a person were trying to find articles on your topic in a database, would your title have enough of the right keywords to pop up? Be sure to mention the text and/or author you're writing about, and include words which reveal something about the main drift of your argument. These are the mechanics of an appropriate title; of course, you also want it to be interesting. A unique or clever turn of phrase can do this for you. You can also take a short phrase from the text which you think particularly relates to what you have to say, and place it before your main title, with a colon to connect them. Here's an example.
"Wild Ecstasies" and "Sober Pleasure": The Relationship between William and Dorothy Wordsworth in "Lines Written a Few Miles above Tintern Abbey"
Hope This Helps!
