Generate an image of a fantastical sky castle. The castle should be suspended in air amidst fluffy white clouds. The artistic style should be dreamlike and soft, akin to pastel drawings. The scope of the picture should include the intricate spires and towers of the castle, brightly colored in shades of light pink, baby blue, mint green, and powdery yellow. The surrounding sky should be a soft, soothing azure, dotted with sleek, white cobwebs of clouds. The image should have a whimsical and airy appeal, void of any text.