The following document has some words that are particularly useful when trying to write about a story/poem/book, etc. They’re words helpful to talk about both theme and specific details that illustrate the ideas you’re discussing.
The following document has some useful information and examples about 1) what the difference is between showing and telling and 2) when to appropriately use each.
The following Web site has ten very useful tips about writing stronger dialogue. The explanations are short but specific and easy to follow.