photorealistic portrait, Yennefer of Vengerberg, small breasts, long, blue-black hair with a slight purple tint, styled in waves, piercing violet eyes, thin eyebrows, pale porcelain skin, elegant dark purple dress with a deep V-neck and lace accents, a silver star-shaped locket around the neck, soft studio lighting, neutral gray background, 8K, hyper-detailed skin textures, sitting on a tree stump