@VulpineAmethyst @MinnieMae @futurebird I always try to assume that some people may be only partially blind, and so can use colour or other things to help fprm the full picture, or may not always have been blind, in which case colour can be useful to bulding a picture from recollection.
But, at heart, I sometimes use alt-text to tell me what the poster wants to say. And so anything that helps convey this is what I try to put in.