Brain with Question Mark - Symbol of Curiosity and Critical Thinking #2002428 (License: Personal Use)

This hand-drawn style illustration depicts a human brain in black outline with a vibrant lime-green inner glow, emphasizing a large black question mark at its core. The design conveys themes of uncertainty, scientific inquiry, decision-making, and metacognition. Its clean, symbolic aesthetic makes it ideal for digital content on neuroscience, education, or artificial intelligence.

Commonly used on landing pages, blog headers, or educational resources about critical thinking, mental health, learning strategies, or AI reasoning. Matches user intent for visual metaphors around questions, doubt, analysis, or cognitive processes.