$post_categories = get_categories(array(
   'orderby' => 'id',
   'order’ => 'DESC',
   'number' => 6,
   'hide_empty' => 0,
   //'exclude'                  =>array(1)
) );


foreach( $post_categories as $category ) {

    //Get category image by custom fields
    $image = get_field( 'featured_image', $category->taxonomy . '_' . $category->term_id);

    echo 'Category image       = '.$image;
    echo 'Category link        = '.get_category_link($category->term_id);
    echo 'Category name        = '.$category->name;
    echo 'Category description = '.$category->description;
}