一幅炭笔素描，描绘[主体]，质感粗糙、纹理丰富，阴影表现力强，线条大胆。背景布满涂抹的渐变与速写本痕迹，呈现出粗粝却优雅的未完成感。
A charcoal sketch of a [subject], raw and textured with expressive shading and bold linework. The background is filled with smudged gradients and sketchbook marks, giving it a gritty, unrefined elegance.
