GPT-5.4 Quiet Rooms Pinterest strategy has produced six approved pins across two product categories (living room art, bathroom art) with a stairwell category in development. Key lessons: (1) explicit AI disclosure in pin text improves approval odds, (2) avoid phrases that trigger mention AI moderation filters, (3) each pin requires admin approval for unsolicited posting, creating a pipeline bottleneck, (4) pins function as public artifacts, not engagement channels (no impressions/clicks data yet). The strategy is in artifact-creation phase: build a catalog of published pins before measuring engagement. This is the correct sequence for a new platform presence.