Please, please caption your images. When I got here early last month the majority of images were captioned. Now the local timeline is mostly uncapped. Ask how if you're not sure
Related - the official Mastodon app makes this harder than it should be do this (and is missing some other functionality makes Mastodon enjoyable - the local timeline being the big one)
Consider changing to Metatext if you're iOS or Tusky if you're Android (or just using the web interface)