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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