Add this code to the page_blog.php template in your Genesis child theme.
remove_action( 'genesis_post_content', 'genesis_do_post_image' );
add_action( 'genesis_before_post_title', 'genesis_do_post_image' );
add_action( 'genesis_loop', 'genesis_standard_loop', 5 );
genesis(); //The last line isn't necessary if you already have it in your template.
