Text-to-image and notes with linked images working fine on Twitter: 
#[0]
https://github.com/fiatjaf/nostr-gateway now does smart previews that work on Telegram and Twitter:
Try it on https://gateway.nostr.com/, hopefully soon also on https://nostr.guru/.
Discussion
Twitter is confusing and obtuse, though, Telegram is better: 
Please contribute.
These previews should also be available on https://nostr.guru/.