tkinter, PIL, canvas上に開いた画像の上に更に画像を重ねて配置したい

前提・実現したいこと

canvas上に任意の画像を開く→
スタンプボタンをクリック→
別ウィンドウでスタンプを選択→
選択したスタンプをcanvas上に重ねて表示→
マウス操作で任意の場所に配置

というスタンプ機能を実装したいです。

該当のソースコード

python
import os,sys
import math
from tkinter import *
from tkinter import ttk
from tkinter import filedialog
from tkinter import messagebox
from tkinter import simpledialog
from PIL import Image, ImageTk, ImageOps
import glob



_maxline = 700

class Application(ttk.Frame):
	def __init__(self, master):
		super().__init__(master)
		self.master = master
		self.master.geometry('620x600+280+240')
		self.grid()
		self.button_create()

	def button_create(self):
		self.photo_var = StringVar()
		ttk.Entry(self.master, textvariable=self.photo_var, width=70).grid(row=0, column=0, pady=100, padx=20)
		self.bln = BooleanVar()
		self.bln.set(True)
		ttk.Button(self.master, text='選択', width=8, command=self.file_select).grid(row=0, column=1, padx=(0, 20))
		ttk.Button(self.master, text='決定', width=8, command=self.image_open).grid(row=0, column=2, padx=(0, 20))

	def file_select(self):
		iDir = os.getenv("HOMEDRIVE") + os.getenv("HOMEPATH") + "\Desktop"
		fTyp = [('','*.jpg;*.jpeg;')]
		filepath = filedialog.askopenfilename(filetypes = fTyp, initialdir = iDir)
		self.photo_var.set(filepath)

	def image_open(self):
		self.image_dir = self.photo_var.get()
		read_image = Image.open(self.image_dir)
		self.xw, self.xh = self.image_resize(read_image)
		self.x_image = read_image.resize((self.xw, self.xh))
		self.image_window()

	def image_resize(self, image):
		magnification = 1
		if image.width > image.height:
			magnification = _maxline / image.width
		else:
			magnification = _maxline / image.height
		w = int(image.width * magnification)
		h = int(image.height * magnification)

		return w, h

	def image_window(self):
		self.photo_window = Toplevel(self.master)
		self.photo_window.title(os.path.basename(self.image_dir) + ' size:%s*%s'% (self.xw, self.xh))
		self.photo_window.geometry('%sx%s+500+240' % (self.xw+1, self.xh+1))
		self.canvas = Canvas(self.photo_window, width=self.xw, height=self.xh)
		self.canvas.grid()
		self.canvas_create(self.x_image)

		buttonlst = {'crop': [50, self.photo_window.destroy], 'mirror': [80, self.photo_window.destroy], 'Rrotate': [110, self.photo_window.destroy], 'Lrotate': [140, self.photo_window.destroy], 'stamp': [170, self.stamp]}
		[ttk.Button(self.canvas, text=key, command=value[1]).place(x=self.xw-100, y=value[0]) for key, value in buttonlst.items()]

	def canvas_create(self, img):
		self.canvas.photo = ImageTk.PhotoImage(image=img)
		self.canvas.create_image(0, 0, anchor='nw', image=self.canvas.photo)

	def stamp(self):
		stamplst = glob.glob('./スタンプ/*.png')
		self.stamp_window = Toplevel(self.photo_window)
		self.stamp_window.geometry('300x360+800+240')
		self.cb = ttk.Combobox(self.stamp_window, state='readonly', width=25)
		self.cb['value'] = stamplst
		self.cb.pack(pady=10)
		self.stamp_canvas = Canvas(self.stamp_window, width=250, height=250)
		self.stamp_canvas.pack(pady=10)

		ttk.Button(self.stamp_window, text='選択', command=self.stamp_selected).pack()

		self.cb.bind('<<ComboboxSelected>>', self.stamp_previous)

	def stamp_previous(self, event):
		read_image = Image.open(self.cb.get())
		self.stamp_image = read_image.resize((250, 250))
		self.stamp_canvas.photo = ImageTk.PhotoImage(image=self.stamp_image)
		self.stamp_canvas.create_image(0, 0, anchor='nw', image=self.stamp_canvas.photo)

	def stamp_selected(self):
		select_stamp = self.cb.get()
		self.stamp_window.destroy()
		stamp = Image.open(select_stamp)
		stamp = stamp.resize((200, 200))
		self.canvas.photo = ImageTk.PhotoImage(image=stamp)
		self.canvas.create_image(0, 0, anchor='nw', image=self.canvas.photo)



def main():
	root = Tk()
	app = Application(master = root)
	app.mainloop()

if __name__ == '__main__':
	main()