黑啤酒液与泡沫雕塑交融的海报

Create a Cannes-level commercial dark beer poster for fictional premium porter brand OBSIDIAN STAG, merging beverage realism, symbolic foam sculpture, and gallery-clean advertising precision into one unified hero image. The core concept is power distilled into form: a single tall pint of dark porter stands perfectly centered against a deep glowing background, while the foam head rises into elegant stag-antler shapes, turning the beer itself into a heraldic emblem. The pint must remain the absolute visual leader.

Use a vertical full-bleed poster with a front-facing hero shot, a perfectly centered pint glass, strong symmetry, and disciplined rule-of-thirds balance. Preserve the exact structure: a commanding headline at the top, one central dark beer glass dominating the frame, sculptural foam antlers rising above the rim, a restrained spread of barley at the base, a small secondary bottle packshot in the lower left, and a compact heraldic brand lockup in the lower right. Keep generous negative space around the foam horns and top headline so the silhouette reads instantly from distance. The composition should feel bold, iconic, minimal, and prestigious.

The hero object is a tall pint glass filled with rich near-black porter, lit to reveal deep ruby-brown transmission and subtle internal movement beneath the dark surface. The foam head is thick, creamy, velvety ivory, and rises into two clean antler-like arcs formed entirely from beer foam and splash, elegant, believable, and slightly asymmetrical like a living shape rather than clip-art. The fictional brand is “OBSIDIAN STAG” and the product line is “VELVET PORTER”. A smaller packshot bottle at the lower left echoes the same identity using dark glass and a premium charcoal, ivory, and muted bronze label. The pint and bottle must feel real, premium, and shelf-credible.