Better image preview

It is often difficult to identify what's what in the content editor, especially with data model content that doesn't have a visual editor.

If you have a list of items that each has an image (1), it would be of great value to see that image in the preview without the need to expand each item manually to identify content.

Even when expanded, image previews are tiny (2), to the point where it's often no longer possible to identify what it shows.

For comparison, this is how a competitor previews images in the content editor (3).