Detailed fantasy book cover illustration, 1girl, beautiful young girl

detailed fantasy book cover illustration, 1girl, beautiful young girl, long flowing hair, serene expression, fairytale forest setting, glowing fireflies, magical portal, vibrant colors, dreamlike atmosphere, whimsical, (best quality,4k,8k,highres,masterpiece:1.2),ultra-detailed,(realistic,photorealistic,photo-realistic:1.37),cinematic lighting,intricate details,fantasy art,digital painting