Check out the header of this blog. I am using the category image plugin, which is a good one and have been using for years now. I use Genesis theme

You can check out any of the category page of this blog, you will find this kind of header and the description.

function archiveHeader() {
    if(is_archive()) {
        if (function_exists('z_taxonomy_image')) {
            $queried_object = get_queried_object();
            $term_id = $queried_object->term_id;
            $imgurl= z_taxonomy_image_url($term_id); 
            if(strlen($imgurl)>=10) {
                echo '<img class="single-featured-image" src="'.$imgurl.'">';
        echo '<div class="container" style="margin-bottom:10px;border-bottom: solid 1px #000;">';
        echo '</div>';
add_action( 'genesis_before_header', 'archiveHeader' );
remove_action( 'genesis_before_loop', 'genesis_do_taxonomy_title_description', 15 );
add_action( 'kish_archive_desc_title', 'genesis_do_taxonomy_title_description',15 );

Please be sure that you are using the Genesis Framework

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