Show image hint in the pop-up for an auto-highlight word while in read mode.
When the user clicks on an auto-highlighted word in read mode, it would be great if the pop-up showed the image hint (by the way, it is so awesome that GIFs work) that has been set up.
It may be incredibly useful to have in lieu of a translation in monolingual mode.

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Steven commented
Steve, I know you are hard at work at Duolingo and have the site in maintenance mode, but I hope you give this feature your consideration. The auto-highlight mode is an amazing, killer feature. It is so much more useful than if it merely highlighted every word that a user looked up before. And being able to see the other contexts in the pop-up really helps improve my understanding of the word and how it used.
Part of why it is great, is that it creates a feeling of progress. There’s nothing like getting further in your text and seeing the number of underlined words gradually dwindle.
I feel like this feature would be relatively simple to implement and would be a big boon to reading with auto-highlighted words.