Welp, i've finally been shamed into consistently adding ALT text to the images I post and, whaddaya know, it's turning out to actually be fun and creative to write prose descriptions of the visuals. This is forcing me to really LOOK at what I'm seeing, something that I, as a sighted person, generally take for granted.
@mralancooper I feel the same way -- thinking about the image, why I'm posting it, details, etc.