It’s possible to add images to cards now, although I admit it’s not the best interface at the moment.

In the “Edit Card” panel, accessible from the reader page, Words page, and Learn page, there is an option to paste an image URL. All you have to do is right click an image on any other site, e.g. Google Image search, select “Copy image URL” or “Copy image location” and paste it into this box. Click the Save button to save this change before exiting.

This image will now appear above the flashcard in the Learn page.

I realise it would be nice to do an image search and automatically present some examples to choose from within Readlang, but this would require paying google or microsoft so I’m avoiding it for now.