Not all posts showing and nav not working

I’m working on redesigning my site and am having some trouble.
http://varriaga.com/artwork/

I am calling my posts by categories and displaying their associated thumbnails. Problem is, not all the posts are showing. The above page is only showing 11 posts, when I have about 20 in that category.

I’m not sure what I did wrong, I copied the code that I used for my last site design (which used the same thumbnail structure) but it’s not working. I made one change in the navigation – I added image links – but the problem existed before I changed that.

Thumbs/posts:

<div id="featuredwork_art">
   	        <div id="portcontent">
			<?php if (have_posts()) : ?>
            <?php $paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
query_posts('posts_per_page=12&cat=6&paged='.$paged); ?>
            <?php while (have_posts()) : the_post(); ?>
			<div class="portpost">
			</div>
			<?php endwhile; ?>
			<div id="recent-content">
				<ul class="recent-projects-port">
            			<li>
<?php $paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
query_posts('posts_per_page=12&cat=6&paged='.$paged); ?>
<?php while (have_posts()) : the_post(); ?>
<a href="<?php the_permalink() ?>" rel="bookmark" title="<?php the_title(); ?>"><img src="<?php echo get_option('home'); ?>/wp-content/thumbs/<?php
// this is where the custom field prints images for each Feature
$values = get_post_custom_values("Thumb"); echo $values[0]; ?>" alt="" /></a>
<?php endwhile; ?>
            			</li>
            	</ul>
            </div>

Navigation:

<div class="port-navigation">
            <span class="previous-entries"><?php previous_post_link('%link', '<img src="/images/back.gif">', TRUE); ?>

</span> | <span class="next-entries"><?php next_post_link('%link', '<img src="/images/next.gif">', TRUE); ?>
</span>
           </div>

I’d appreciate any help.
Thanks. :]