Step-by-Step Guide

1. Place the castle shell against the starry sky. Begin by placing the mint-teal wall shell onto the lilac striped floor as shown by the empty layout. Set the backdrop to the deep space sky with scattered stars and a large moon at the top-right corner. Ensure the floor's beveled front lip remains visible.
2. Place rooftops, domes, and crescent moons. Crown the castle with a purple onion dome at the top summit and a glowing crescent hanging from it. Add tall needle-like spires with mint caps, a squat turret with a floral wreath, and a smaller turquoise crescent above the main façade.
3. Install windows: grand lattice and side arches. Place a cathedral-style arched window with gold lattice on the left façade, spanning two floors. Add matching arched windows on the right stair tower and a dormer with a diamond pane near the right top nook.
4. Build staircases and balcony rails. Snap a pale-mint stair set to the right edge and mirror a shorter stair run inside. Wrap balcony edges with matching rails and ensure proper spacing of newel posts.
5. Furnish the ground-floor potion lab. Arrange a plush lavender sofa, bubbling cauldron, potion shelves, and a small doorway under the stairs. Include witches casting spells and reading.
6. Create the bakery-kitchen on the mid balcony. Position an arched stone oven, shelves with jars and plates, a wooden table with pastries, and add critter apprentices in action.
7. Set the upper study with wardrobe and trophies. Arrange a carved wardrobe rail, a stout table with a crystal ball, and balance the area with a stool while maintaining a clear walkway.
8. Arrange the sleepy bedroom nook on the top right. Create a cozy nook with plush cushions, a sleeping figure, and a small turret with a plant, ensuring the scene remains open.
9. Add airborne magic and exterior towers. Position a witch on a broom in flight, dragon silhouettes in the sky, and spired towers along the edges to frame the scene.
10. Finish with rail decorations, lights, and clutter. Enhance the scene with bread, mushroom-lamps, books, herbs, and ensure all details are precisely placed for completion.