diff --git a/plugins/value_rank/main.py b/plugins/value_rank/main.py
index 8e8ed80..6946b1e 100644
--- a/plugins/value_rank/main.py
+++ b/plugins/value_rank/main.py
@@ -1,6 +1,8 @@
 # -*- coding: utf-8 -*-
+import base64
 import json
 import math
+import mimetypes
 import re
 import xml.etree.ElementTree as ET
 from datetime import datetime, timedelta
@@ -1459,6 +1461,7 @@ class ValueRankPlugin(MessagePluginInterface):
                 }
 
         cm = ContactManager.get_instance()
+        strongest_uid = selected_nodes[0] if selected_nodes else ""
         edge_svg_parts: List[str] = []
         # 边数字标签只给“最重要的少数边”：
         # 1. 全边标数字时，图面会被 0/1、1/0 这类噪声淹没；
@@ -1484,6 +1487,24 @@ class ValueRankPlugin(MessagePluginInterface):
                 units += 1.0 if ord(ch) < 128 else 1.75
             return units
 
+        def _build_avatar_data_url(raw_avatar_url: str, wxid: str) -> str:
+            """优先读取本地缓存头像并转 data URL，减少截图时依赖远端头像可用性。"""
+            # 社交图渲染发生在 Playwright 截图流程中：
+            # 1. 如果直接给远端头像 URL，链接过期、网络抖动或防盗链都可能导致头像空白；
+            # 2. 这里优先确保头像已缓存到本地，再内联为 data URL，截图时最稳定；
+            # 3. 如果本地缓存仍失败，再回退到原始 URL，尽量不影响图谱整体生成。
+            local_avatar_path = str(cm.ensure_head_image_cached(wxid) or "").strip()
+            if local_avatar_path:
+                try:
+                    avatar_path = Path(local_avatar_path)
+                    image_bytes = avatar_path.read_bytes()
+                    mime_type = mimetypes.guess_type(str(avatar_path))[0] or "image/jpeg"
+                    base64_str = base64.b64encode(image_bytes).decode("utf-8")
+                    return f"data:{mime_type};base64,{base64_str}"
+                except Exception as exc:
+                    self.LOG.debug(f"[{self.name}] 头像转 data url 失败: wxid={wxid}, error={exc}")
+            return str(raw_avatar_url or "").strip()
+
         for edge_idx, (a, b, mention_count, score, a_to_b_count, b_to_a_count) in enumerate(selected_edges, start=1):
             ax, ay = pos_map[a]
             bx, by = pos_map[b]
@@ -1541,9 +1562,8 @@ class ValueRankPlugin(MessagePluginInterface):
             nick = cm.get_group_name(group_id, uid) or uid
             display_nick = _shorten_graph_nick(str(nick), 8)
             safe_nick = html.escape(display_nick)
-            avatar_url = str(cm.get_head_image(uid) or "").strip()
+            avatar_url = _build_avatar_data_url(str(cm.get_head_image(uid) or "").strip(), uid)
             ring_idx = int(node_meta_map.get(uid, {}).get("ring_idx", 0))
-            angle = float(node_meta_map.get(uid, {}).get("angle", 0.0))
 
             # 使用“连接度越高环线越偏暖”的视觉策略，帮助快速识别核心节点。
             ring_color = "rgba(255, 152, 0, 0.95)" if size_norm >= 0.6 else "rgba(79, 123, 201, 0.95)"
@@ -1576,6 +1596,34 @@ class ValueRankPlugin(MessagePluginInterface):
                     f'{html.escape(str(nick)[:1] or "?")}</text>'
                 )
 
+            # 最强核心节点补一个皇冠标记：
+            # 1. strongest_uid 取当前排序后的第一名，代表群里最强的桥梁/核心节点；
+            # 2. 皇冠放在头像上方，视觉上比文字提示更直观；
+            # 3. 使用简单 SVG 形状，避免依赖字体里的 emoji / 特殊字符。
+            if uid == strongest_uid:
+                crown_y = y - node_radius - 16.0
+                crown_points = [
+                    (x - 15.0, crown_y + 18.0),
+                    (x - 10.0, crown_y + 6.0),
+                    (x - 2.5, crown_y + 14.0),
+                    (x + 0.0, crown_y + 2.0),
+                    (x + 2.5, crown_y + 14.0),
+                    (x + 10.0, crown_y + 6.0),
+                    (x + 15.0, crown_y + 18.0),
+                ]
+                crown_points_text = " ".join([f"{px:.1f},{py:.1f}" for px, py in crown_points])
+                node_svg_parts.append(
+                    f'<g>'
+                    f'<rect x="{x - 15.0:.1f}" y="{crown_y + 18.0:.1f}" width="30.0" height="5.5" rx="2.8" ry="2.8" '
+                    f'fill="rgba(255, 183, 3, 0.98)" stroke="rgba(168, 104, 0, 0.85)" stroke-width="1.0"></rect>'
+                    f'<polygon points="{crown_points_text}" fill="rgba(255, 202, 40, 0.98)" '
+                    f'stroke="rgba(168, 104, 0, 0.85)" stroke-width="1.2"></polygon>'
+                    f'<circle cx="{x - 10.0:.1f}" cy="{crown_y + 6.0:.1f}" r="2.2" fill="rgba(255,255,255,0.96)"></circle>'
+                    f'<circle cx="{x + 0.0:.1f}" cy="{crown_y + 2.0:.1f}" r="2.4" fill="rgba(255,255,255,0.96)"></circle>'
+                    f'<circle cx="{x + 10.0:.1f}" cy="{crown_y + 6.0:.1f}" r="2.2" fill="rgba(255,255,255,0.96)"></circle>'
+                    f'</g>'
+                )
+
             # “连接人数”改成贴在头像上的数字徽标：
             # 1. 用户反馈原先那行“连接x · 分数y”混在线条里看不清；
             # 2. 数字徽标直接挂在节点边缘，读图时更像“这个人连了多少人”；
@@ -1595,30 +1643,17 @@ class ValueRankPlugin(MessagePluginInterface):
                 f'font-size="{badge_font_size}" fill="#2F3B52" font-weight="700">{badge_text}</text>'
             )
 
-            # 节点文案只保留昵称，并加半透明底板：
-            # 1. 去掉第二行数值后，名字可以更干净地贴在节点旁边；
-            # 2. 底板能把名字从复杂连线背景里“托”出来；
-            # 3. 长昵称做截断，避免外围节点之间互相顶住。
-            outward_dx = math.cos(angle)
-            outward_dy = math.sin(angle)
-            label_gap = node_radius + (14.0 if ring_idx == 0 else 18.0 + ring_idx * 2.0)
-            title_x = x + outward_dx * label_gap
-            title_y = y + outward_dy * label_gap
-            if abs(outward_dx) < 0.20:
-                anchor = "middle"
-            elif outward_dx > 0:
-                anchor = "start"
-            else:
-                anchor = "end"
+            # 名字固定放在头像正下方，避免沿径向排布带来的“漂移感”：
+            # 1. 用户反馈名字位置飘忽，说明相对角度布局不利于快速扫图；
+            # 2. 统一放在头像下方后，读图路径会稳定很多；
+            # 3. 底板保留，继续提升名字在复杂线条背景上的可读性。
+            title_x = x
+            title_y = y + node_radius + 24.0
+            anchor = "middle"
             label_units = _estimate_label_units(display_nick)
             label_width = max(44.0, min(156.0, 10.0 * label_units + 18.0))
             label_height = 24.0
-            if anchor == "middle":
-                label_box_x = title_x - label_width / 2.0
-            elif anchor == "start":
-                label_box_x = title_x - 8.0
-            else:
-                label_box_x = title_x - label_width + 8.0
+            label_box_x = title_x - label_width / 2.0
             label_box_y = title_y - 18.0
             node_svg_parts.append(
                 f'<rect x="{label_box_x:.1f}" y="{label_box_y:.1f}" width="{label_width:.1f}" height="{label_height:.1f}" '