The most important thing about a philosophy essay is that it has a clear argument, with both explanation of idea and analysis of these idea. A good essay will start with a brief introduction of the key issues mentioned in the essay and what the line of argument will be, ideally using some of the words from the question to make it clear to the examiner that you are engaging with the question (e.g. I will suggest that emotivism is not a useful meta-ethical theory). Then there should be several, clearly distinct paragraphs explaining the key ideas surrounding the questions, with each paragraph including relevant analysis from both scholars and your own opinion. Finally, a conclusion will summarise the key argument and clarify your own opinion.