How to loop custom post_type from (a) specific category(ies)?

This is my loop, try using it.

<!-- Post -->
<?php
$paged= (get_query_var('paged' )) ? get_query_var('paged'):1; 
global $query_string;
$myquery = wp_parse_args($query_string);
$myquery = array(
    'paged' => $paged,
    'posts_per_page'=>6,
    'post_type' => 'portfolio'.
    'tax_query' => array(
        'relation' => 'OR',
        array(
            'taxonomy' => 'category',
            'terms' => array('picture'),
            'field' => 'slug',
        ),
    ),
 );
query_posts($myquery);

while ( have_posts() ) : the_post();
?>

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