A formidable fictional Celtic fire priestess stands within an ancient stone circle during a dramatic Beltane festival bonfire at twilight, wearing flowing deep emerald and gold-threaded ceremonial robes with intricate Celtic knot and flame embroidery and a towering gold and amber beaded headpiece with dangling fire opal ornaments, her long fiery red hair adorned with fresh May flowers and ember sparks, gripping a sacred ceremonial fire iron, fierce transcendent expression, dramatic warm amber bonfire illumination contrasting cool violet twilight sky from distant ancient oaks, rich details of weathered standing stones carved with ogham script and distant misty Celtic highlands, oil painting texture with digital precision, powerful dignified three-quarter composition against epic twilight sky with dramatic rising fire spirits and emerging ancient Celtic celestial horse symbolism, 4k hyperdetailed digital art