With regard to the "writing" part of it, leave at dead words that have no really emotional content. Try avoiding the words:is, am, are, was, were, be, being, and been for starters. This will force you to write stronger sentences which most likely will be more vivid.
In addition to textual support, you must remember to explain WHY your textual support helps your argument. You can't just drop quotes, paraphrases or examples into an essay -- you must follow those ideas up with an explanation in your own words of what that evidence shows. Ask your self "WHY? does this prove something?" and then write your "because" answer as a complete thought after the evidence.
The word vividly implies illustration of one's points. Therefore, specific examples are needed to support any statements that are made. The citation of specific lines of dialogue or passages from the literary work under consideration which underscore a point or illustrate it are absolutely essential. Textual support is the key ingredient to vivid responses to literature since, in essence, one must prove whatever points one makes about a literary text.