A compelling UPSC essay should be characterized by clarity of thought, coherence, and depth of analysis. Starting with a strong thesis statement establishes the central argument. Use of relevant examples and data can support claims, providing substance to the narrative. It's important to maintain a structured format with well-defined paragraphs that enhance readability. Additionally, integrating various perspectives—including contrary viewpoints—demonstrates critical thinking and depth. Finally, a strong conclusion that reiterates the key points will leave a lasting impression on the evaluators.