Clean Journal Update Child theme archive image size

/**
 * Template for Featured Image in Archive Content
 *
 * @override function from child theme
 */
function clean_journal_archive_content_image() {
    $options            = clean_journal_get_theme_options();

    $featured_image = $options['content_layout'];

    if ( has_post_thumbnail() && 'full-content' != $featured_image ) { ?>
        <figure class="featured-image">
            <a rel="bookmark" href="<?php the_permalink(); ?>">
            <?php
                    if ( 'excerpt-image-left' == $featured_image  || 'excerpt-image-right' == $featured_image  ) {
                         the_post_thumbnail( 'clean-journal-square' );
                    }
                    elseif ( 'excerpt-image-top' == $featured_image  ) {
                         the_post_thumbnail( 'clean-journal-featured' );
                    }
                    elseif ( 'excerpt-full-image' == $featured_image  ) {
                         the_post_thumbnail( 'full' );
                    }
                ?>
            </a>
        </figure>
    <?php
    }
}

/**
 * Add new image size
 */
function clean_journal_child_add_image_size() {
    add_image_size( 'clean-journal-square', 250, 250, true );
}
add_action( 'after_setup_theme', 'clean_journal_child_add_image_size' );