This page displays only the listings for a specific user. By default the software uses the title module which has not specific title for the seller's other listings page. There are also no specific system generated meta tags. To customize any header tag for the current user viewed look to the following smarty tag:

{$seller_username}

That will place the username for the current seller's other listing page where ever that tag is placed at the template level. Using the above you could place meta and/or title tags like the following:

<title>Listings for {$seller_username}</title>
<meta name="title" content="listings for {$seller_username}">
<meta name="description" content="listings for {$seller_username}">

You would place the above tags or whatever you create within the html head for that page. By default this page uses the following page template:

/main_page/basic_page.tpl

which will contain the html head to place the above tags. The problem is that page template is used on many pages within the system and the above smarty variable is not available on them. So you have a couple options for adding meta/header tags specifically for use in the seller's other listings page. You can create a copy of the basic_page.tpl template possibly naming it sellers_other_listing_page.tpl template and then assigning that page template to that page within the following admin tool:

DESIGN > PAGE ATTACHMENTS

You can also use a smarty if tag like the one you find on the general pages meta tag placement support wiki page and simply place a smarty if tag within the current page template assigned to only display tags when the current page is displayed.