Here's a refined approach specifically for an "epic snowy background".

Positive Prompt:
"Depict an expansive and breathtaking snowy realm. Imagine towering snow-capped peaks, vast icy plains, and swirling snowflakes caught in a dance by the chilly wind. Think of a land dominated by white, where the snow glistens as if sprinkled with a thousand diamonds and the cold atmosphere creates a hushed, reverent silence. This world is untouched, pristine, and represents the epitome of winter's majesty."

Negative Prompt:
"Avoid any elements that detract from the essence of a pure snowy spectacle. Eschew hints of other seasons, like blossoming flowers or green foliage. Sidestep warm hues and vibes of spring or summer. Instead, immerse entirely in the cold, crystalline beauty of an epic winter wonderland."

By focusing more tightly on the snowy elements and explicitly stating what to avoid, this might help in generating the desired snowy images.
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