Please include alt text (image descriptions) for visually impaired users. To add alt text to an existing toot, choose Edit under the 3-dot menu, delete the image, then put the image back and add the alt text when you do. If for some reason you can't add alt text yourself, you can add the hashtag Alt4Me to the toot to request a volunteer to add an image description in a reply. If you follow @PleaseCaption, they will automatically nudge you when you forget to add alt text to a toot with an image.