[Muellmann]

In Admin Control Panel (ACP):

-Search Templates "postbit_attachmentimage"
-Edit / Customize "postbit_attachmentimage"

Replace all with:

<img class="attach" src="attachment.php?$session[sessionurl]attachmentid=$attachment[attachmentid]&amp;stc=1&amp;d=$attachment[dateline]" border="0" alt="$attachment[filename] - views: $attachment[counter] - size: $attachment[filesize] - id: $attachment[attachmentid]" />&nbsp;

Then you have at least the base infos for pictures in "Attached Images".
For including an alt tag that can be specified by a user, you have to add at
first a custom field into your db in table "attachment" (not recommended).