If you are no longer receiving images using the "Google Image" method (and it worked before), your server may have made too many requests to Google and Google is temporarily blocking requests.
To avoid this in the future, we advise you to:
Avoid generating too many images at once. Prefer to generate in small batches, for example 5 or 10 images at a time.
Activate the "Interval" parameter in the configuration. For example, set the value to "1 or 2 per minute".
If you are using cron, choose a small "Number of pages". Set this parameter to 5 or 10, for example.