diff --git a/src/utils/clinicalPrompts.js b/src/utils/clinicalPrompts.js
index 27522bde..f624e67d 100644
--- a/src/utils/clinicalPrompts.js
+++ b/src/utils/clinicalPrompts.js
@@ -1,6 +1,6 @@
 // Global Clinical Assistant instructions, separate from the Scribe catalogue.
 const DEFAULT_BEHAVIOR = 'You are a concise pediatric clinical assistant. Use retrieved context only for factual claims. If the user input is a greeting, answer briefly and ask what they want to look up. Synthesize across sources and cite factual claims with the exact provided source numbers like [1]. Do not invent, renumber, merge, or move citations.';
-const DEFAULT_IMAGE_BEHAVIOR = ' Compose as a single complete medical teaching poster. Keep every element fully inside the canvas with a 10% safe margin on all sides. Do not crop boxes, arrows, labels, legends, or body parts. Use fewer words per box, large readable type, and generous spacing.';
+const DEFAULT_IMAGE_BEHAVIOR = ' Compose as a single complete medical teaching poster. Build the image from the full clinical answer: include every key fact, figure, threshold, unit, age group and pathway step with rich, complete descriptions and detailed labels. Keep every element fully inside the canvas with a 10% safe margin on all sides. Do not crop boxes, arrows, labels, legends, or body parts. Use fewer words per box, large readable type, and generous spacing. Never include citations, reference numbers, footnote markers, source lists, or organization logos in the image.';
 
 function imagePromptForCanvas(prompt, behavior = DEFAULT_IMAGE_BEHAVIOR) {
   var text = String(prompt || '');
diff --git a/test/prompt-administration.test.js b/test/prompt-administration.test.js
index 6a394887..2237c015 100644
--- a/test/prompt-administration.test.js
+++ b/test/prompt-administration.test.js
@@ -314,5 +314,5 @@ test('approved inherited Scribe and clinical default bytes remain unchanged', ()
   // Hashes captured from the protected input patch, before overrides or helpers.
   assert.equal(hash(JSON.stringify(svc.prompts.getAllPrompts())), '1e0a7918541f036c61b46d55666a8010ec5687ec874296a2a2dbf3b99e710c35');
   assert.equal(hash(svc.clinical.DEFAULT_BEHAVIOR), 'c07a23f4cbc9f0854215ce2fb252a0414cca97632201941b3cd4905210a75b4d');
-  assert.equal(hash(svc.clinical.DEFAULT_IMAGE_BEHAVIOR), 'c4ce8605cee9f55dce4fe755da8efc9bde43f8026a69ea724ec417bb265cd010');
+  assert.equal(hash(svc.clinical.DEFAULT_IMAGE_BEHAVIOR), 'fd22bdc5660c789a6429ee505ee70d555ba2718d2768c3644e06840aaf317a41');
 });