Hình Vẽ Nguệch Ngoạc Bút Lông Tối Giản

A simple hand-drawn doodle based on the reference photo, sketched using a [black marker]. Features natural marker strokes, slightly wobbly outlines, subtle hand-drawn imperfections, and slightly open line endings. Style: warm editorial doodle aesthetic, airy, flat, minimal, and understated. Color palette: black linework with [sky blue] used sparingly only as an accent color. Avoid clean vector graphics, 3D shading, or polished digital perfection.