Hey @Lucy, to find the broken or invalid images links on a webpage you can use HTTPClient library to check status codes of the images on a page. If they don't load correctly, then it will be registered with likely a 404 but not a 200 status code. We can easily say tell whether the link is broken or not with status codes. If the status code is 404, then image link is invalid/broken. You can try this code snippet to find broken images:
int invalidImageCount = 0; 
WebDriver driver = new FirefoxDriver(); 
driver.get("http://google.com");
List<WebElement> imagesList = driver.findElements(By.tagName("img")); 
System.out.println("Total no. of images are " + imagesList.size()); 
for (WebElement imgElement : imagesList) { 
 if (imgElement != null) { 
  try { 
   HttpClient client = HttpClientBuilder.create().build(); 
   HttpGet request = new HttpGet(imgElement.getAttribute("src")); 
   HttpResponse response = client.execute(request); 
   // verifying response code he HttpStatus should be 200 if not, 
   // increment as invalid images count 
   if (response.getStatusLine().getStatusCode() != 200) 
     invalidImageCount++; 
   } catch (Exception e) { 
     e.printStackTrace(); 
   }
  } 
 } 
System.out.println("Total no. of invalid images are " + invalidImageCount);