tkInter and Pillow don't display any images in GUIs - program gives errors instead

[SomeRandomGuy]

Doesn't work: https://imgur.com/a/u5Hw2I8 (image of result and proof I changed the script and how the image should look like under it - two pictures in one link).

Script:

import tkinter as tk
from PIL import Image, ImageTk

w, h = (864, 576)

root = tk.Tk()


def firstGUI():
    canvas = tk.Canvas(root, height=h, width=w)
    canvas.pack()

    bg = ImageTk.PhotoImage(Image.open("characterwindow01.jpg"))
    bg_l = tk.Label(root, image=bg)
    bg_l.place()


firstGUI()
root.mainloop()