钢笔线稿时间演变分析图：老城区

时间演变分析图，多阶段并列，主体为老城区，统一俯视轴测，手绘钢笔线稿风格，细腻的墨线，极少量淡彩，复古牛皮纸配色，米黄、驼色、棕色与深咖，同一视角的多个阶段并列排列，底部时间轴，每个阶段新增的部分用强调色高亮，构图简洁，信息层级清晰，大量留白，画面中不出现文字和标注，高清，适合设计展板

historical evolution diagram with stages side by side of an old city district, consistent top-down axonometric view, hand-drawn ink line drawing, fine pen strokes, minimal light color wash, vintage kraft paper palette of beige, camel, brown and dark coffee, several stages of the same area arranged side by side from the same viewpoint, timeline along the bottom, newly added parts highlighted in accent color, clean composition, clear visual hierarchy, generous white space, no text or labels in the image, high resolution, architecture presentation board