[Python] I am not able to set the background image on top-level window [duplicate]

I have used many modules and also used global variable but its not appearing I don't know what's the issue

def start_quizz(topic, quiz_type, level=1, coustmer=None):
global bg_image_quiz_img
def proceed_to_next_level():
nonlocal level
if quiz_type == "MCQs":
if score >= 50:
level += 1
print(f"Proceeding to Level {level} for {coustmer}") # Debug statement
if level <= 5:
start_quizz(topic, quiz_type, level, coustmer)
else:
messagebox.showinfo("Quiz Completed", "You've completed all levels. Well done!")
else:
if score >= 30:
level += 1
print(f"Proceeding to Level {level} for {coustmer}") # Debug statement
if level <= 5:
start_quizz(topic, quiz_type, level, coustmer)
else:
messagebox.showinfo("Quiz Completed", "You've completed all levels. Well done!")

questions = fetch_questions(topic, level, quiz_type) # Fetch questions based on quiz type
if questions:
print(f"Questions fetched for {quiz_type} - Level {level}: {questions}") # Debug statement
quiz_window = tk.Toplevel()
quiz_window.title(f"Quiz - {topic} ({quiz_type}, Level {level})")
quiz_window.geometry("800x600")


bg_image_quiz_img = tk.PhotoImage(file=r"C:\Users\lenovo\Pictures\quiz.png")
bg_image_quiz = tk.Label(quiz_window, image=bg_image_quiz_img)
bg_image_quiz.place(relheight=1, relwidth=1) # Set full-screen background


enter image description here

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