1.
The easiest way is to use the plugin “Admin Columns”, to show the picture in columns https://wordpress.org/plugins/codepress-admin-columns/
2.
You also can code your own admin page with the function add_submenu_page().
http://codex.wordpress.org/Function_Reference/add_submenu_page
You can create a query, loop through the posts and show the pictures.
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