question on tkinter canvas PhotoImage

[gr3yali3n]

I want to put an image in a window above the buttons.
but the window is blank where the canvas is supposed to be.?

from tkinter import *
from PIL import ImageTk,Image
root = Tk()
root.geometry("480x480")
root.title("planets")
label =Label(root , text = "what planet would you like to know about?")
label.grid(row =15 , column = 1)

canvas = Canvas(root , width = 200 , height = 200)
canvas.grid(row = 10 , column = 3 )

photo = PhotoImage('gif.gif')
canvas.create_image(0,0 , anchor = NW, image = photo)

root.mainloop()