You’re definitely going the best route by asking for/gaining routine feedback from #[2] and any other users that identify as blind or have degrees of blindness foremost.
The NIP as you have it works though 💜 It would say Image Description and a user could drop in an image description. Could even be shorted to ID as the text; people either know or will gain understanding as to what it means.
In the interim, users aiming to make their posts most inclusive can type ID or Image Description above their photo and a screen reader will pick up the visual.
Separate/along these lines: users can Camel Case their hashtags to make them easier to read for people living with low vision or conditions like dyslexia. Like: #ImOnNostrNow v #imonostrnow
