Until joining Mastodon, I had never seen anyone post content with alt text for the blind. I was absolutely amazed to see that happening here, but also, a bit timid as I've never been great at descriptive language under normal circumstances. Turns out, I was way over-thinking it.
Today, I found this piece from Harvard University which offers best practices for alt text. Please consider leaving any additional resources you may have found in the comments below and boost so that others can see this.
https://accessibility.huit.harvard.edu/describe-content-images