[Python] Python Tkinter image labels displaying background colour instead of the images

I'm a rookie programmer looking to develop a sort of "surface generator" for funzies. I have a problem though, when generating all of the tiles present in the script, instead of it using the 19x19 tiles I saved as pngs, it merely displays background colour, in this case being transparent.

And I have no idea why. Would any kind soul look at my code and tell me why is this happening? The function causing this issue is the importtiles function.

# IMPORTS
import tkinter as tk
from tkinter import PhotoImage
import random

#DIVIDE GREENHOUSE POWER BY 60 TO OBTAIN DESIRED TEMPERATURE !!

#DEFINE
def importtiles():
count = 0
c1 = 0
c2 = 0
f0 = 'andesite.png'
f1 = 'sand.png'
for i in range(1, 1008):
np = open('PlanetSurface.txt', 'r')
#print(i)
material = np.readline(i)
length = len(material)
if length > 1:
material = material[:-1]
print(material)
if material == '1':
f = 'andesite.png'
elif material == '0':
f = 'sand.png'
else:
input('Error')
#Intentionally crashes the script
gorbashovodarasboda = 888 + 'webiwabo'
if count == 42:
c2 = c2 + 19
c1 = 0
count = 0
print(i)
tile = PhotoImage(file=f)
exec('t'+str(i)+'= tk.Label(g,image=tile,bg="pink")')
exec('t'+str(i)+'.place(x=c1, y=c2)')
print(c1)
c1 = c1 + 19
count = count + 1
def newplanet(name):
np = open('Planet.txt', 'w')
np.write(name + '\nTemperature\n2000\nEquator no greenhouse aiming temperature\n(-7)\nCarbon Dioxide\n450000\nWater Vapor\n50000\nOxygen\n0\nGreenhouse Power\n5371\nCalculated Base Temperature With Greenhouse\n91')
def surfacegen():
np = open('PlanetSurface.txt', 'w')
ti = random.randint(0,1)
np.write(str(ti)+'\n')
np = open('PlanetSurface.txt', 'a')
for i in range(0,1007):
toss = random.randint(0,3)
if toss == 3:
ti = random.randint(0, 1)
np.write(str(ti)+'\n')
tilecount = 0
choice = input('Do you wish to create a new planet or to load an existing one? \n'+'Answer with 1 or 2. ')

#BEGIN

if choice == '1':
name = input("Type in the name of your planet ")
newplanet(name)
surfacegen()
g = tk.Tk()
g.geometry('800x600')
g.resizable(0, 0)
g.configure(background='black')
g.wm_attributes("-transparentcolor", 'pink')
importtiles()
g.update()
input('end')
else:
#ELIF to be added
print('doo doo')



I attempted to generate 1000 tiles spread across several rows. The script generated this fine however it generated it with background colours instead of the tile pngs I assigned. I expected tiles with respectively grey and yellow pngs, but got all transparent tiles.

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