Why does the script show only one picture?

Question

Python

Hello!
The script should show about 50 pictures, and then it shows one empty Label.
Here is the actual script

import io
from time import sleep
from threading import Thread
from tkinter import Tk, Canvas, Label, Button, BOTTOM, CENTER, mainloop
from PIL import Image, ImageTk
import requests
from bs4 import BeautifulSoup


class Application(Tk):
    url_images = "http://bipbap.ru/pictures/prikolnye-kartinki-pro-programmistov-55-foto.html"

    headers = {
            'User-Agent': 'Mozilla/5.0 (Windows NT 6.2) AppleWebKit/537.36\
            (KHTML, like Gecko) Chrome/63.0.3239.84 Safari/537.36',
            'Accept-Language': 'ru-RU,ru;q=0.9,en-US;q=0.8,en;q=0.7'}
    
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.geometry('800x600+300+100')
        
        self.title('Просмотр картинок из интернета не сохраняя на диск')
        
        self.resizable(width=False, height=False)

        self.button = Button(self, text = 'начать просмотр', command = self.run)
        self.button.pack(side = BOTTOM)

        self.thread = Thread(target=self.image_upload)
        
    def run(self):
        self.thread.start()
        
        self.button.config(state='disabled') 

    def image_upload(self):
        response = requests.get(self.url_images, headers=self.headers)

        soup = BeautifulSoup(response.content, 'lxml')

        links_image = []
        
        for link in soup.find_all('img'):
                links_image.append((link.get('src')))
        for link_image in links_image:
            response = requests.get(link_image, headers=self.headers)
            bytes_content = io.BytesIO(response.content)
            image = Image.open(bytes_content)
            w, h = image.size
            image_tk = ImageTk.PhotoImage(image)
                
            panel = Label(self, image=image_tk, justify=CENTER)
            panel.config(width=w, height=h)
            panel.pack(fill="both", expand="no")

if __name__ == "__main__":
    application = Application()
    application.mainloop()