Once you have the basic structure of your essay, fill in the gaps.
Descriptive Essay Structure, Structure of Descriptive Essay
This is perhaps the most commonly neglected element of structured writing. It concerns the paragraphs into which your prose is organized. Each paragraph should focus on one main point. The point of each paragraph should build on that in the previous paragraph, and create the foundations of the next. Each paragraph should be a necessary part of the overall structure of your essay.
THE STRUCTURE OF AN ESSAY DRAFT - U-System
I find that a useful mental exercise is to boil down the arguments of each paragraph, one after the other, into single sentences. Then, put all these sentences together into a consecutive narrative, looking to see whether each sentence can be made to flow naturally from the sentence previous to it, and into the sentence following. This will highlight any major structural problems. If you are not able to boil down each of the paragraphs into a single sentence summary (however simplistic), then the offending paragraphs most likely need to be rewritten more clearly. If there are gaps or non-sequiturs when you put the one sentence summaries together, then the meso-structure of your essay needs to be re-organized, by cutting and pasting paragraphs, or by introducing new paragraphs to fill the gaps, or deleting old paragraphs that detract from the flow of your argument.