Tkinter, overlay foreground image on top of a background image with transparency

Question

I have 2 images, in png format. The second image, is a shape with transparent background.

First image:

Second image:

I cannot make the second image on top of the first at given coordinates (x,y) with the first image visible through the transparent zone of the second image.

Result desired:

import Tkinter
import Image, ImageTk

# open an image
head = Image.open('background2.png')
hand = Image.open('foreground2.png')
root = Tkinter.Tk()  # A root window for displaying objects

head.paste(hand,(20,20))

# Convert the Image object into a TkPhoto object
tkimage = ImageTk.PhotoImage(head)

root.mainloop() # Start the GUI

An empty tk window is displayed.

Solution

Thanks Bryan. Got it, in addition to label, the issue of transparency resolved from another question here (same foregound image used as a mask)

I guess, this is what cost me -2 points :-|

Now it works as expected.

from Tkinter import *
import Tkinter
from PIL import Image, ImageTk

root = Tkinter.Tk()  # A root window for displaying objects
# open image
imageHead = Image.open('head.png')
imageHand = Image.open('hand.png')

imageHead.paste(imageHand, (20, 40), imageHand)
# Convert the Image object into a TkPhoto object
tkimage = ImageTk.PhotoImage(imageHead)

panel1 = Label(root, image=tkimage)
panel1.grid(row=0, column=2, sticky=E)
root.mainloop()  # Start the GUI