Display posts on one page

I’m trying to manipulate a template file in, so it show all the posts with the featured image. The code underneath works but i can style the thumbnails.. I’m working in the bones theme. I know is hard to help when you can′t see the css but I’m working locally.. But can someone at least tell me if I’m doing the php correct?

Many thanks

Kristian

<?php $args = array( 'numberposts' => -1 );
            $postlist = get_posts($args);
            foreach ($postlist as $post) {
                setup_postdata($post);
                if (has_post_thumbnail()) {
                    echo '<section class="entry-content clearfix">';
                    the_post_thumbnail('bones-thumb-601');
                    echo '<h5>';
                    the_title();
                    echo '</h5>';
                    echo '</section>';
                }
            }
        ?>

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