Ключевые слова: abstract, abstract art, abstract charcoal, abstract drawing, abstract lines, artistic, artistic expression, artistic lines, artistic shading, artistic sketch, black, black and gray, black and white, black shades, charcoal, charcoal art, charcoal drawing, charcoal lines, charcoal patterns, charcoal shading, charcoal texture, gray sketch, gray tones, grey, monochromatic art, monochrome, monochrome sketch, paper art, paper texture, rough art, rough canvas, rough paper, rough sketch, rough texture, shading, sketch, sketch art, sketch background, sketch pattern, sketchy art,