app = Tk()
lm = Label()
def change_image():
    tempd = Image.open("teo.jpg")
    photo2 = ImageTk.PhotoImage(tempd)
    imp.config(image=photo2)
    imp.image = photo2
temp = Image.open("file01.jpg")
photo = ImageTk.PhotoImage(temp)
imp = Label(app,image=photo)
change_image()
imp.pack()
app.mainloop()

import tkinter as tk
from PIL import ImageTk, Image

#Cambia immagine
def change():
    img2 = ImageTk.PhotoImage(Image.open("path/immagine"))
    panel.configure(image=img2)
    panel.image = img2

#Master
master = tk.Tk()
img = ImageTk.PhotoImage(Image.open("path/immagine"))
panel = tk.Label(master, image=img)
button = tk.Button(master, text="Cambia immagine", command=change)
io = tk.Label(master, text="by Palmux",font=("Helvetica", 7))

#Pack
panel.pack(side="top", fill="both", expand="yes")
button.pack()
io.pack()

#Mainloop
master.mainloop()