Expressionist oil painting, heavy impasto, lone figure standing on concrete rooftop overlooking endless cityscape, thick sculptural paint layers forming storm clouds above skyscrapers, wind-whipped coat rendered in aggressive palette knife strokes, warm amber windows contrasting cool slate blues, dramatic chiaroscuro between shadowed alleys and glowing towers, textured brushwork emphasizing isolation, urban geometry dissolving into expressive paint handling, emotional tension in every impasto ridge