A majestic landscape illustration featuring towering mountains that pierce through the cloud layer, set against the deep indigo sky of night. Behind the jagged mountain peaks looms the colossal, detailed silhouette of a giant planet, dominating the celestial background. Fluffy, dramatic cumulus clouds float near the summits, illuminated by the faint glow of the planet. At the foot of the mountains lies a grand, illuminated castle with intricate spires and glowing windows, serving as a focal point in the lower foreground. The scene is rendered in high-quality anime style with sharp details and vibrant contrasts. The atmosphere is serene yet awe-inspiring, with a cool color palette dominated by blues and purples, punctuated by the warm golden light emanating from the castle and the subtle starlight. The composition emphasizes verticality and scale, creating a sense of wonder and tranquility.