Antique Halloween Cauldron Posters

This is a detailed image-generation prompt template built to produce vintage-style Halloween poster art — the kind that mimics early 1900s illustrated postcards and etched prints. It combines four swappable variables (CHARACTERS, DETAILS, PALETTE, THEME) with a fixed stylistic backbone (line-art engraving, crosshatching, aged-paper texture, vertical poster composition) so you get a consistent "antique print" look no matter what scene you drop in.