Compose an image where the brute force of the Hulk and the agility of Spiderman are personified in two distinct characters, standing opposed in a tense cityscape at twilight. On one side, the Hulk, his green skin reflecting the fading light, muscles bulging, with an expression of unstoppable rage. Opposite him, Spiderman crouches, ready to leap, his suit's red and blue colors vibrant against the encroaching shadows of the city. Between them, the urban jungle's concrete and steel are tinged with the last golden rays of sunlight and the creeping blue of evening, symbolizing the clash of day and night, of raw power and swift grace. The composition captures them in a frozen moment before the clash, each exuding their signature essence, their eyes locked in a fierce, anticipatory stare down, with dramatic lighting casting half their faces in shadow, the other half illuminated, showcasing the high stakes of their impending battle. v 6.0