Generate a high-key graphic poster based on any subject: The upper half of the image establishes a dense and orderly array of line-drawn group portraits or similar symbols. All elements are repeatedly arranged with thin black lines, simplified facial features, or geometric outlines, forming a rhythm similar to a wall of people; in this homogeneous repetition, set a clear thematic focus. The focus does not win by complex realism but is recognized at a glance through small-area theme-derived accent colors, slight contrast, local blank space, or morphological differences, creating a visual moment of "suddenly being seen among many similar individuals." Below, a large quiet information area is reserved. The main title uses heavy, compact, low-center-of-gravity black block characters. The typeface has a poster printing feel and strong weight. Auxiliary text forms a rational explanatory layer with small font sizes, neat line spacing, and clear alignment. Image density and text white space form an upper-lower contrast. Colors are extracted from the material, emotion, and semantics of the subject itself, without copying fixed color numbers: a large area of background serves as a bright and clean structural base color, occupying the main visual area; black or dark lines bear the order, text, and information skeleton; a small amount of high-saturation theme accent color falls only on key focal points or necessary details, with a restrained area but striking position. The overall style remains transparent, light, and clean with a high-key temperament, clear edges, uniform lines, and simple color levels, avoiding stacked shadows, dirty textures, and realistic impurities, so that the subject is quickly remembered through repetitive arrays, single-point differences, and steady text weight.

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Subject: Good morning, Shanghai
Color Scheme: Red tones as accent color
Aspect Ratio: 16:9