A woman in a black dress and a pumpkin costume

digital art vintage 50’s advertisement style poster. Gothic Harley Quinn summons a giant orange pumpkin with a green stem and a spooky face. The title is ‘Happy Halloween!!’ written with large, curved, and dripping letters in yellow and purple. The title is centered at the top of the poster. The background is a dark blue sky with white stars and a full moon. Harley Quinn is grinning wickedly in front of a gothic castle with tall towers, pointed roofs, and arched windows. The castle is on a hill and has a fence around it. The poster has a low-angle view and a dramatic lighting that creates contrast and shadows. 8k resolution, photorealistic quality.