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Drawings and detailed descriptions are invaluable tools for describing your patent to the Patent Office. In order to have valid specifications for an invention, you must convey the invention using clear, concise, and exact terms that anyone with ordinary skill in the field of your invention would be able to make and use the invention. While you are only required to relay the best mode for carrying out the invention, disclosing all modes possible will lead to a stronger application.
For utility patents, it is also important to include drawings of your invention that your detailed description reference. According to the USPTO, "The drawings must show every feature of the invention as specified in the claims." (Nonprovisional (Utility) Patent Application Filing Guide) Drawings must be clear and follow USPTO guidelines. Drawings are reviewed by a drawing reviewer before the patent is viewed by an examiner, so a patent could be rejected for incorrect drawings before a formal review. Think of the specifications and drawing sections as your chance to sell the patent. You must stress the advantages of the invention and clearly demonstrate how the invention works.
For drawings, it is important that every significant part has its own reference number (starting with a number higher than your highest figure number), and that no number is repeated for a different part. If you draw the same part in multiple figures, each part must be labeled with the same number in each drawing. Make sure your drawings do not use arrowheads to point out a part unless it refers to an entire assembly. You should label every drawing figure.
As a general guideline for writing specifications, try to keep sentences under 13 words, and no paragraph longer than 150-200 words. A heading should be listed for about every two pages of discussion. Ensure that all terms are clearly defined if they are not common terms. Writing should be formal but to the point, without any filler sentences or words.