improve usage tip

app.py

@@ -289,7 +289,7 @@ with gr.Blocks(css=css) as demo:
                 gen_init = gr.Button(value="Generate 3 new init images")
 
             prompt = gr.Dropdown(label="Prompt",
-                       info="Try something like 'man/woman walking on the beach'",
+                       info="Try something like 'man/woman walking on the beach'. If the face is not in focus, try adding 'face portrait of' in the beginning.",
                        value=None,
                        allow_custom_value=True,
                        filterable=False,