Create a portrait of a beautiful girl in a serene nature setting, exuding a mysterious aura. She has long, flowing black hair adorned with various kinds of vibrant roses, which contrast beautifully against her fair skin. Her striking blue eyes draw the viewer in, reflecting the soft, natural light that bathes the scene. She wears an elegant dress that flows gently with the breeze, harmonizing with the lush greenery and soft-focus background of trees and wildflowers. The image should have a shallow depth of field, emphasizing her features while creating a dreamy, ethereal atmosphere.