Working with images Link https://www.drupal.org/docs/core-modules-and-themes/core-modules/image-module/w… Drupal documentation on working with images.
Regenerate Images After Image Style Change Link https://www.gyanblog.com/drupal/drupal-regenerate-images-from-style-change/ When you change your image styles for existing images, you need to regenerate them or else the old styles will still be visible...