Like trello also does: show the first image (or an image you could chose) as the card title image that shows in the card on the board-view. that would help a lot if you'd use this for e.g. a scrum process.

Here's a mockup (at this time, we parse the board using injected javascript and then query the api for the description and search for the first image, but it would be nicer, if gitlab could do this directly)