Elegant Pencil Portrait of Young Woman

Create a clean black-and-white pencil portrait illustration of a young woman with a serene expression, facing forward and centered on a plain white background. She has {argument name="hair color" default="very light blonde rendered as pale graphite lines"}, long flowing hair parted in the middle, cascading over both shoulders with many fine individual strand lines and soft wave texture. Her face is softly oval with symmetrical features, large almond-shaped eyes, defined natural eyebrows, a delicate straight nose, full softly closed lips, a gentle jawline, smooth cheeks, and subtle realistic shading. Show her from the upper chest upward with bare shoulders in an elegant off-shoulder pose, her right hand placed diagonally across her chest with five visible fingers and neatly shaped nails. Use refined graphite line art, thin contour lines, delicate cross-hatching, very light tonal shading, high-key white negative space, polished fashion-sketch realism, and no color. Keep the composition minimal and graceful, with the head near the top center, hair occupying both sides of the frame, and the hand as the only prominent accessory-like element. No text, no jewelry, no background objects, no harsh shadows, no watermark.