The code above looks like summary template code only.
I suggest you look into default category template, where you can find code example of how to make first article different from others (it's
foreach statement with
start and
loop variables).
For example, within box article list module, you can have something like this:
Code:
<vte:foreach item = "article" from = "{article_list}" start="1" loop="1">
Code for the article with image (you can even include summary/default.tpl template here)
</vte:foreach>
<ul>
<vte:foreach item = "article" from = "{article_list}" start="2">
<li><a href="{article.get_href}"><vte:value select="{article.title}" /></a></li>
</vte:foreach>
</ul>