A formidable Celtic druid priestess from a fictional Iron Age Brython tribe stands in an ancient stone circle during a dramatic Beltane fire festival, wearing layered wool and fur robes with intricate Celtic knot embroidery and a flowing ivy crown, her flaming red hair adorned with golden torc necklaces and belted fire crystals, gripping a ceremonial oak staff with spiraled carvings, fierce mystical expression, dramatic warm orange firelight illumination contrasting cool deep blue night shadows from towering oak trees, rich details of standing stones carved with spiral glyphs and dancing torchbearers, oil painting texture with digital precision, powerful dignified three-quarter composition against epic night sky with blazing Beltane flames and rising Pleiades constellation, 4k hyperdetailed digital art