limit the number of posts on a page that displays only posts from 1 category

Hello! I know this question has been asked already and I’ve tried some options, but nothing worked.. maybe because of the way I excluded the posts on this particular page. What I’d like to do is override the WP settings of amount of posts, only for this ‘page blog’ that shows only 1 category. Can I do that?

The template for this category blog looks like this:

<?php
/*
Template Name: pokkie
*/
?>

<?php global $more;?>

<?php get_header(); ?>

	<div class="grid_11">
      <div id="content">
<?php if (qtrans_getLanguage() == 'en') : ?><h2 style="padding-top: 30px; font-size: 22px;">Commissioned work</h2><p>I'll blog a selection of my illustrations here.</p>

<?php else : ?><h2 style="padding-top: 30px; font-size: 22px;">Werk in opdracht</h2><p>Hier blog ik een selectie van mijn illustraties.</p>

<?php endif; ?>			

<?php
$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
$args= array(
	'category_name' => 'port',
	'paged' => $paged
);
query_posts($args);

?>

		<?php if (have_posts()) : while (have_posts()) : the_post(); ?>

		<div class="post" id="post-<?php the_ID(); ?>">
		<h2><?php the_title(); ?></h2>

<?php
$front_page_category = get_posts( 'category=portobello' );
if( is_front_page() && $front_page_category ) {
	foreach( $front_page_category as $post ) {
		setup_postdata( $post );
		/* do loop stuff here */
	}
}
?>
			<div class="entry">
					<?php the_content('<em>Continue reading →</em>'); ?>
				</div>
<?php if (qtrans_getLanguage() == 'en') : ?><p STYLE="clear: left;" class="portfoliometadata"><?php the_time('d') ?> <?php the_time('M y') ?>
</p>

<?php else : ?><p STYLE="clear: left;" class="portfoliometadata"><?php the_time('d') ?> <?php the_time('M y') ?>
</p>

<?php endif; ?>

				<div class="clearfix"></div>

			</div>

		<?php endwhile; ?>

		<div class="navigation">
<?php if (qtrans_getLanguage() == 'en') : ?><div class="alignleft"><?php next_posts_link('← Older work') ?></div>
			<div class="alignright"><?php previous_posts_link('Newer work →') ?></div>
<?php else : ?><div class="alignleft"><?php next_posts_link('← Ouder werk') ?></div>
			<div class="alignright"><?php previous_posts_link('Nieuwer werk →') ?></div><?php endif; ?>

			<div class="clearfix"></div>
		</div>

	<?php else : ?>

		<h2 class="center">Not Found</h2>
		<p class="center">Sorry, but you are looking for something that isn't here.</p>
		<?php //get_search_form(); ?>

	<?php endif; ?>

	</div>

	</div>

<?php get_sidebar(); ?>

Thanks a million for the one who knows which code to put where!:)