Here’s an updated prompt for a grayscale version with hard contrast:
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"A powerful, intimidating dragon coiled atop a mountain of treasure, illustrated in grayscale with intense, high-contrast shading. The dragon's scales are intricately detailed, capturing a range of light and dark tones to emphasize its fierce, muscular build. Its eyes gleam with a piercing brightness amidst the dark tones, casting an eerie, intelligent gaze. The wings are spread slightly, with deep shadows accentuating the leathery texture and veins. The style uses bold, expressive brushstrokes and strong contrasts to highlight the dragon against the background of a dimly lit cavern, creating a dramatic, intense atmosphere."
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This will focus on the dramatic effect of grayscale and contrast, enhancing the dragon’s intimidating features. Let me know if you’d like any other adjustments!