Chân Dung Bút Bi Trầm Tư Bên Cửa Sổ

An ultra-detailed monochromatic [blue] ballpoint pen (biro art) full-body portrait on textured paper, completely hand-drawn using a single pen with fine linework, smooth layering, hatching, and cross-hatching. Subject: The woman from the reference photo, maintaining 100% facial accuracy, exact facial structure, eye shape, nose, lips, and natural features. Her hairstyle matches the reference photo's length and type, neatly refined and naturally arranged. She wears a light-colored soft-textured sweater and [jeans] that fold naturally. Sitting on the floor beside a window, leaning gently back against the wall, one knee drawn up with arms resting over it, the other leg folded along the floor in a relaxed, reflective pose. Head & Expression: Profile or three-quarter view looking out the window away from the viewer. Her expression is calm, deeply introspective, and lost in thought. Her eyes have delicate eyelid definition, soft outward focus, and subtle light catchlights. Setting: A vintage [90s] home interior with a weathered window on the left side above floor level, featuring slightly worn surfaces and simple moldings. Lighting & Shading: Strong directional natural light entering from the left window. Soft highlights and exposed paper tone on the illuminated side, transitioning into deep shadows with dense cross-hatching on the right. Smooth tonal gradients without blotchy ink. Rendering & Edges: Museum-grade pen-and-ink drawing on paper. The edges of the illustration softly fade out into empty paper on all sides, with no hard crop borders.