simple tkinter question function call not opening image

[gr3yali3n]

i tried that and that isn't working either,i wasn't sure if it was the name of the image ,the path or what but i tried both as parameters when calling the function open_image(). but tkinter just opens the geometry window and the blank 200x200 Frame but no image.
i dont see what is going wrong here.
this is where i am grabbing the image: photo = ImageTk.PhotoImage(Image.open(image_name))
this is where i am creating the Label to pack the photo onto : photo_label = Label(image=photo)
then just pack the dang thing to the frame
and call the function with my image..

from tkinter import *
from PIL import ImageTk,Image


root = Tk()
root.geometry("400x400")


def open_image(image_name):
	frame = Frame(root,width=200,height=200,bd=5,bg='white')
	frame.pack(pady=15)


	photo = ImageTk.PhotoImage(Image.open(image_name))
	photo_label = Label(image=photo)
	photo_label.pack()

open_image('babu.jpg')  #the name of the image is babu.jpg 

root.mainloop()