you have two options for clear cache images:
Command via CLI: sudo rm -rf pub/media/catalog/product/cache/
Stores-Syste-Cache Management-Flush Catalog Images Cache
Of course, if you want to speed up the creation of the image cache (images are displayed on the page from the cache), run
sudo bin/magento-cli catalog:image:resize
Command sudo bin/magento-cli cache:flush does not affect the page and images.
Magento docs presents:
You can also clean and flush cache types in the Magento Admin. Go to System > Tools > Cache Management. Flush Cache Storage is equivalent to bin/magento-cli cache:flush. Flush Magento Cache is equivalent to bin/magento-cli cache:clean.
Maybe it will help