Whimsical Halloween Ghost Greeting Poster

Halloween greeting poster, vertical 9:16, painterly digital illustration. [Colors] Deep violet sky #4B2A6B fading to warm amber horizon #F0A44B, glowing moon cream #FFE7A8, pumpkin orange #EE7C28. [Layout] Large calligraphic headline occupies the upper half, hero character centered low, a huge moon disc behind the right side, castle silhouette at the right edge, footer greeting block at the bottom. [Typography] Sweeping dry-brush script in an orange gradient with rough ink tails, small date numerals, delicate handwritten caption below, tiny letterspaced footer. [Subject] A round cheerful ghost wearing an oversized purple witch hat with a mini pumpkin buckle, bursting out of a giant carved jack-o'-lantern with both arms raised; two smaller pumpkins flanking, a bare tree at left, gothic castle towers behind. [Lighting & Mood] Warm internal glow from the pumpkin, hazy lunar halo, whimsical and inviting. [Details] Silhouetted bats, a small pumpkin on the hat brim, dry-brush edges, faint stars, purple mist pooling at the base.