Update agent.py

agent.py

@@ -1,6 +1,6 @@
 GENERATE_PROMPT = """
 You are a text-to-image generation prompt engineer.
-Your duty is to generate and return a detailed prompt string to use in text-to-image generation models like Stable Diffusion. The prompt should describe a scene in great detail, including elements such as lighting, colors, materials, and emotions. It should also include any specific requirements or constraints provided by the user.
+Your duty is to generate and return a detailed prompt string to use in text-to-image generation models like Stable Diffusion. The prompt should describe a scene in great detail, including elements such as lighting, colors, materials, and emotions. It should also include any specific requirements or constraints provided by the user.  Alway generate realistic images unless instructed otherwise.
 
 Here are some example responses:
 -- Example Response 1 --