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{
  "type": "annotated architectural concept sketch",
  "subject": "a hand-drawn isometric ink illustration of the historic Mostar-style stone arch bridge spanning a river, with clustered medieval stone buildings on both banks and two square watchtowers",
  "style": {
    "medium": "black graphite and technical pen linework",
    "look": "architectural field notebook, concept art, detailed hatching, crosshatching, visible construction lines, rough perspective guide marks",
    "paper": "aged cream graph paper with evenly spaced square grid, slightly yellowed background",
    "color": "monochrome black and gray ink only, no watercolor except subtle paper tone"
  },
  "scene": {
    "main landmark": "{argument name=\"bridge name\" default=\"stone arch bridge\"}",
    "river": "{argument name=\"river name\" default=\"River Neretva\"}",
    "architecture": "Balkan Ottoman-era stone buildings with tiled roofs, small rectangular windows, arched doorways, stacked hillside masonry, one cafe terrace at the lower right riverbank",
    "composition": "wide landscape canvas, three-quarter aerial isometric view, left village cluster higher on the page, right village cluster lower on the page, large single-span arch bridge centered diagonally across the river",
    "details": "arched bridge deck with parapets, flagpoles with small flags along the bridge, stone textures, roof tile patterns, riverbank vegetation scribbles, light shadows beneath the bridge"
  },
  "layout": {
    "labels": {
      "count": 8,
      "items": [
        {
          "text": "STONE BUILDINGS",
          "position": "top left",
          "points_to": "left cluster of stone houses"
        },
        {
          "text": "WATCHTOWER (LEFT)",
          "position": "top center-left",
          "points_to": "tall square tower above the left bank"
        },
        {
          "text": "stone arch bridge",
          "position": "upper center-right",
          "points_to": "main bridge span"
        },
        {
          "text": "FLAGS",
          "position": "upper right of bridge",
          "points_to": "row of flagpoles on bridge"
        },
        {
          "text": "WATCHTOWER (RIGHT)",
          "position": "top right",
          "points_to": "tall square tower on the right bank"
        },
        {
          "text": "STONE BUILDINGS",
          "position": "right middle",
          "points_to": "right cluster of stone houses"
        },
        {
          "text": "CAFE TERRACE",
          "position": "bottom right",
          "points_to": "small covered terrace by the river"
        },
        {
          "text": "River Neretva",
          "position": "lower left river area",
          "points_to": "river flowing under the bridge"
        }
      ]
    },
    "annotation_style": "uppercase sans-serif handwritten labels with curved arrow callouts, clean black lettering",
    "grid": "full-page visible square grid behind all drawing elements"
  },
  "text_parameters": {
    "left watchtower label": "{argument name=\"left tower label\" default=\"WATCHTOWER (LEFT)\"}",
    "right watchtower label": "{argument name=\"right tower label\" default=\"WATCHTOWER (RIGHT)\"}",
    "cafe label": "{argument name=\"cafe label\" default=\"CAFE TERRACE\"}"
  },
  "rendering_instructions": "Generate a precise but hand-sketched architectural diagram, not a photorealistic image. Keep the background clean and uncluttered, preserve the graph-paper notebook aesthetic, use strong line hierarchy for the bridge and buildings, lighter sketch lines for terrain and river flow, and make every label legible in English."
}