it's tricky but i recommend this essay: audio.mcsweeneys.net/transcripts/... a large part of it is about the experience of ASL and Protactile as a DeafBlind person, but theres a section near the end about image descriptions and how to get at the most essential content, I found it very revealing!

Had a quick skim of that and looks interesting so I've bookmarked it to have a proper look when I get a chance, thank you so much for sharing it