Python - Cómo reemplazar una imagen en tkinter

#importaciones

from tkinter import *

from random import randint

from tkinter.messagebox import *

import sys

#funciones

def funcDisney():

    global a

    Label(ahorcado,width = 14, height = 20, bg = "floral white").place(x = 45, y = 65)

    Label(ahorcado, text = "Disney          ", font = ("Comic Sans MS", 18, "bold"), bg = "blue").place(x = 50, y = 20)

    tema_palabras = "Disney.txt"

    txt = open(tema_palabras,"r")

    letrasave = StringVar()

    lista = list(txt.read().split("\n"))

    word = lista[randint(0,(len(lista)-1))].lower()

    letraenter = Entry(ahorcado, width = 1, font = ("Comic Sans MS", 20), textvariable = letrasave).place(x = 390, y = 402)

    vidas = Label(ahorcado, text = intentos, bg = "red1", font = ("fixedsys",24), relief = "raised", bd = 6).place(x = 905, y = 394)

    espacio_letra = [Label(ahorcado, text = "_", font = ("Comic Sans MS", 22), bg = "floral white") for _ in word]

    for i in range(len(word)):

        espacio_letra[i].place(x = a, y = 300)

        a += 50

    def comprobar():

        global intentos

        global aciertos

        global numarchivo

        enter.append(letrasave.get())

        if letrasave.get() in word:

            usadas = Label(ahorcado, text = enter, bg = "floral white", font = ("Comic Sans MS",16, "bold"), relief = "ridge", bd = 4).place(x = 50, y = 500)

            if word.count(letrasave.get())>1:

                aciertos += word.count(letrasave.get())

                for i in range(len(word)):

                    if word[i] == letrasave.get():

                        espacio_letra[i].config(text = "" + letrasave.get())

            else:

                aciertos += 1

                espacio_letra[word.index(letrasave.get())].config(text = "" + letrasave.get())

            if aciertos == len(word):

                showwarning(title = "VICTORIA", message = "Felicidades, lo salvaste!! heroe sin capa, si esto fuera un examen deberian darte un 10")

                sys.exit()

        else:

            usadas = Label(ahorcado, text = enter, bg = "floral white", font = ("Comic Sans MS",16, "bold"), relief = "ridge", bd = 4).place(x = 50, y = 500)

            intentos -= 1

            numarchivo += 1

            vidas = Label(ahorcado, text = intentos, bg = "red1", font = ("fixedsys",24), relief = "raised", bd = 6).place(x = 905, y = 394)

            imagen = PhotoImage(file = "ahorcado" + str(numarchivo) + ".png")

            Label(root, image = imagen).place(x = 340, y = 50)

            if intentos == 0:

                vidas = Label(ahorcado, text = ":(", bg = "red1", font = ("fixedsys",24), relief = "raised", bd = 6).place(x = 905, y = 394)

                showwarning(title = "GAME OVER", message = "No te quedan vidas dummy, intentalo de nuevo :(")

                sys.exit()

    boton_comprobar = Button(ahorcado, text = "Probar suerte x(", bg = "gold" , font = ("Comic Sans MS", 16), command = comprobar).place(x = 440, y = 401)

root = Tk()

root.config(cursor = "pencil", width = 1100, height = 700, bg = "gold", relief = "raised", bd = 25)

ahorcado = Frame(root)

ahorcado.config(width = 1100, height = 700, bg = "floral white", relief = "sunken", bd = 30)

ahorcado.grid_propagate(False)

ahorcado.pack()

imagen = PhotoImage(file = "ahorcado1.png")

Disney = PhotoImage(file = "Disney.png")

Label(root, image = imagen).place(x = 340, y = 50)

Label(ahorcado, text = "Vidas restantes <3 :", font = ("Comic Sans MS", 18, "bold")).place(x = 650, y = 404)

Label(ahorcado, text = "Ingresa una Letra: ", font = ("Comic Sans MS", 24, "bold")).place(x = 50, y = 400)

Label(ahorcado, text = "Letras usadas:", font = ("Comic Sans MS", 18, "bold")).place(x = 50, y = 455)

Label(ahorcado, text = "Elige un Tema:", font = ("Comic Sans MS", 18, "bold")).place(x = 50, y = 20)

#variables

a = 275

intentos = 8

aciertos = 0

numarchivo = 1

enter = []

#Procesos

boton_Disney = Button(ahorcado, image = Disney, command = funcDisney ).place(x = 50, y = 70)

root.mainloop()