The essential elements of a good answer in the UPSC essay paper include clarity of thought, coherence, relevance, and balance. Structuring the essay with a clear introduction, well-developed body paragraphs, and a concise conclusion is vital for effective communication. Candidates should strive to present a nuanced perspective by incorporating facts, examples, and critical analysis, ensuring they address multiple dimensions of the topic. Additionally, proper grammar, vocabulary, and a formal tone enhance overall impression. Ultimately, a compelling essay reflects a deep understanding of issues and the ability to engage critically.