How do I write a good character prompt for the best results?

Be descriptive! Instead of just “a wizard,” try “a wise old wizard with a kind, weathered face and a long white beard, wearing star-patterned blue robes, casting a soft, glowing spell in his library, detailed portrait, fantasy.”

For the best results with character prompts, include details about the character's appearance, personality/mood, setting/pose, and the desired character style.