Use first reference image for visual style only: sparse white-space storybook watercolor vignette, loose brown ink linework, muted earth tones, clean cream paper margins. Historical grounding is mandatory: early 15th-century Dai Viet, Vietnamese/East Asian faces, Dai Viet clothing and Ming East Asian military context, Vietnamese villages, Thanh Hoa-Nghe An mountains and Red River plain settings. Keep illustration centered, 45–60% canvas, with large clean white/cream empty space. Scene: failed anti-Ming uprisings fading, great citadels under Ming control, a new hidden plan beginning in Lam Son. Negative: no European faces, no Roman soldiers, no crusader armor, no medieval European castle, no biblical desert, no Middle Eastern robes, no samurai, no fantasy armor, no text, no subtitles, no watermark, no logo, no photorealism, no 3D, no anime.