Why not just break images down into hex string and make it part of the json payload? The clients can then reassemble the hex into an image on the other side? Relays can charge extra. There are decentralized ways to transfer media.
Discussion
Amethyst supports rendering images with base64 encoding directly in a note
It does hurt query performance on relays though when doing wildcard searches
That's badass tho didn't know that
You’d also want to require the client to convert to webp and limit width and height
Absolutely
