Have you applied the latest update? It's been some time since internal Tor was integrated, and Blossom was rolled out yesterday. You can easily enable image loading on Tor by flipping the switch if necessary. It can be done by default to the same settings as the relays.

My old-ass phone is already crying about memory, and downloading the app from Github is still a pain, so I'm going to wait. Seriously though, is there anything stopping someone from straight up uploading child porn? Will Amethyst users just be randomly downloading it by default?