Another fault is lack of clear organization. Stick to the point, and organize your essays logically. If you depart from it, do so only after you have fulfilled the stated requirements first. The role of opinion and judgment are an important aspect of historical writing. Opinions can be defined as unsupported generalizations.
Judgments are conclusions or inferences based upon supporting facts.
Be clear about this distinction. Handbook for Writers of Research Papers. Although you may get carried away in your enthusiasm, please try to limit all papers to the assigned length. Rude, George, The Crowd in the French Revolution . Oxford University Press, 1972.