Create an adult coloring page featuring an "Undead Ball" where dancing skeletons and ghosts elegantly waltz in a grand hall. Focus on clean and minimalistic lines, emphasizing the contour drawing of the dancing figures. The grand hall should include classic architectural details such as tall pillars, chandeliers, and grand archways. Aim for a composition that balances both the undead figures and the grandeur of the hall. --ar 3:4 --v 5.2