<?php
//get current
$post_terms = get_the_terms($post->ID, 'the-creating-artists');
if($post_terms){ //put everything inside this, makes sure that if there is no terms set we wont get just any posts
    $slug_array = array();
    foreach($post_terms as $single_term){
        $slug_array[] = $single_term->term_id;
    }
    // args
    $args = array(
        'posts_per_page' => 3,
        'post_type' => 'artists',
        'orderby' => 'rand'
        'tax_query' => array(
            array(
                'taxonomy' => 'the-creating-artists',
                'field' => 'term_id',
                'terms' => $slug_array
            )
        )
    );
    // the query
    $the_query = new WP_Query( $args );
    if($the_query->have_posts()){
        echo '<ul>';
            while($the_query->have_posts){
                $the_query->the_post();
                echo '<li><a href="'.get_permalink().'">'.get_the_title().'</a></li>';
            }
            wp_reset_postdata();
        echo '</ul>';
    }else{
        echo '<p>No related posts</p>';
    }
}else{
    echo '<p>No related posts</p>';
}
?>