On their way through the web the images themselves are visible to "anyone" (any nodes or shared ethernets the packets go through), so if your photos are incriminating you should find a host you're willing to trust that will serve them https-only, or host them yourself.

Those of us having grown up bringing film to the drugstore aren't too concerned about URLs in our ISP's proxy server logs. Nobody cares about your facebook photos enough to risk their job at the ISP to steal them.