Python pygame сделал анимацию но картинки налепливаються друг на друга, как сделать чтобы прошлая картинка удалялась?

 import pygame  
pygame.init()  
clock = pygame.time.Clock()  
window = pygame.display.set_mode((1280, 720))  
runned = True  
color_bg = 0  
pygame.display.set_caption('My Game')  
icon = pygame.image.load('png/icon.png')  
bg = pygame.image.load('png/bg.jpg')  
 
pygame.display.set_icon(icon)  
 
player = pygame.image.load('png/right/1.png')  
 
player_anim_count = 1  
 
while runned:  
 
    window.fill((0, 0, 0)) 
     
    window.blit(bg, (0,0))  
 
    if player_anim_count == 2:  
        player = pygame.image.load('png/right/2.png')  
    elif player_anim_count == 3:  
        player = pygame.image.load('png/right/3.png')  
    elif player_anim_count == 4:  
        player = pygame.image.load('png/right/4.png')  
  
    window.blit(player, (250,475))  
 
    if player_anim_count == 4:  
        player_anim_count = 1  
    else:  
        player_anim_count += 1 
 
    pygame.display.flip() 
 
    clock.tick(60)  
 
    for event in pygame.event.get(): 
        if event.type == pygame.QUIT: 
            runned = False 
 
pygame.quit()  

 import pygame 
 
pygame.init() 
 
flags = pygame.DOUBLEBUF | pygame.RESIZABLE 
window = pygame.display.set_mode((1280, 720), flags) 
clock = pygame.time.Clock() 
pygame.display.set_caption('My Game') 
icon = pygame.image.load('png/icon.png') 
pygame.display.set_icon(icon) 
 
bg = pygame.image.load('png/bg.jpg').convert() 
player_images = [pygame.image.load(f'png/right/{i}.png').convert_alpha() for i in range(1, 5)] 
player_anim_count = 0 
 
WHITE = (255, 255, 255) 
font = pygame.font.Font(None, 36) 
 
runned = True 
while runned: 
    for event in pygame.event.get(): 
        if event.type == pygame.QUIT: 
            runned = False 
 
    window.blit(bg, (0, 0)) 
 
    shadow_offset = (5, 5) 
    shadow_color = (0, 0, 0, 128) 
 
    shadow_rect = player_images[player_anim_count].get_rect(topleft=(250 + shadow_offset[0], 475 + shadow_offset[1])) 
    pygame.draw.rect(window, shadow_color, shadow_rect) 
    window.blit(player_images[player_anim_count], (250, 475)) 
 
    player_anim_count = (player_anim_count + 1) % len(player_images) 
 
    text_surface = font.render("Анимация игрока", True, WHITE) 
    window.blit(text_surface, (10, 10)) 
 
    pygame.display.flip() 
    clock.tick(30) 
 
pygame.quit()