I believe in vivid description during preaching. It takes time for an idea to form in the minds and hearts of listeners. It takes specific detail for listeners to “see” a Biblical story and to feel its tension. But the solution is not simply to add and embellish freely.
1. Preach the text, not the event. The writer made choices. He chose to selectively include limited detail and was inspired in the choice of each word. So while it is tempting to fill out the details, be careful not to lose the point the writer is making. For example, in the gospels, each writer is writing historically accurate accounts, but is doing so theologically. A writer may include or omit specific details in order to make his point. If we simply harmonize all four gospels and preach the resulting composite story, we will be preaching the event rather than the text. It is a good idea to consult a harmony of the gospels to make sure your description is historically accurate, but preach your specific text. The event is historically true, but the text is inspired.
2. Preach the text, not added detail. There is a constant danger that in telling a story well, we might preach an idea born out of the added (uninspired) detail. Therefore, it is critical to do solid exegetical work in the text before working on how to tell the story. Work on the passage must come before work on the message. Then if you decide to add some detail, you can do so carefully, seeking to honor the emphasis and detail of the text.
Biblical Preaching 
I think we are walking a tightrope here. Often times detail is needed to really make the people understand what is happening. I remember Kelly Miller Smith in his book on Social Crisis Preaching quoted an author who used a metaphor of “freeze drying.” When the Bible writer wrote the story, some details were left out. What the preacher often has to do is add “water” or “details” to the sermon so that the original story can come out in all of its splendor.
However, one must be careful, like you are noting, that one does not come with a totally different story with a totally different emphasis. But in the metaphor of freeze drying, if you add too much water you are no longer tasting the food, you are tasting the additives. So one must take caution when doing it, but can one preach without doing it at least on occasion?
I am new to preaching, this help me