How to get an image to appear in Tkinter?

Question

I created a gui using Python Tkinter. It is a publication year search and whenever a user inputs a year value for example, 2021, the corresponding image will be displayed.

I am having difficulty as when I click the search button, nothing appears.

This is my code:

import tkinter
from tkinter import *
from tkinter import ttk
from PIL import Image, ImageTk

main = Tk()
main.geometry("750x250")
main.title("Publication Year Search")

L1 = Label(main, text="Publication Year", fg='black')
L1.grid(row=0, column=0, padx=5, pady=10)


def getDate():
    date = int(EB.get())

    if date == 2021:
        load = Image.open("pic-1.png")
        render = ImageTk.PhotoImage(load)
        img = Label(main, image=render)
        img.grid(row=3,column=3)


EB = Entry(main, width=10)
EB.grid(row=0, column=2)

buttonSub = Button(main, text='Search', command=getDate)
buttonSub.grid(row=3, column=2)

main.mainloop()