Jeremy Herve on "[Plugin: Jetpack by WordPress.com] Please remove all cached images"

If you don't want your images to be served by Photon, you can deactivate the module under Jetpack > Settings in your dashboard. As soon as you do so, your images will be served locally again.

If you'd like to continue to use Photon, but would like to refresh the cache for some specific images that can't be uploaded again under a different file name, you can post a list of those images here, I'll be happy to flush the cache for those images for you.

I can't, however, flush cache for the whole site for you, unfortunately. It's currently not possible, due to technical limitations. You can read more about it here.

I hope this helps and clarifies things a bit.