Create a breathtaking scene of an alien planet with stunning landscapes and a vivid, colorful nebula in the sky. The planet features majestic mountain ranges, crystal-clear lakes, and lush, otherworldly vegetation that glows softly in the twilight. The sky is dominated by a brilliant nebula, with swirling clouds of vibrant colors like purple, blue, and pink, illuminating the atmosphere with an ethereal light. The nebula's intricate patterns and radiant hues cast a magical glow on the planet's surface, creating a serene and awe-inspiring environment. The overall feel should be serene, mystical, and full of wonder, capturing the beauty of an alien world in harmony with the cosmos.