A majestic Celtic druid priestess with flowing auburn hair and ancient silver jewelry, standing in a misty stone circle at twilight during a supernatural solstice ceremony, expressive mystical green eyes with detailed moonlight reflections, cel-shaded with bold black outlines, dynamic upward composition with floating glowing rune particles and swirling mist tendrils, deep forest green and soft silver moonlight palette with ethereal glow, ancient sacred mood, scattered floating firefly wisps and distant rolling hill silhouettes, Celtic mythology concept art with soft bokeh of distant standing stones