Currently such functionality is not coming out-of-the-box, but you can try and customize the template for backend image module - you can find it in the SDK:
C:\Program Files (x86)\Telerik\Sitefinity 4.3\SDK\Content\Resources\WidgetTemplates\Backend\Libraries
(the path may vary due to your setup ).
What I can suggest you to try for the album cover is to create a custom field for the albums and set it as thumbnail for the album. Then you can choose a picture for that thumbnail and edit the template accordingly so that the "cover" is correctly shown.
All the best,
the Telerik team
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