add_action( 'genesis_entry_header', 'sk_remove_images_features' );
function sk_remove_images_features() {
    // var_dump( get_post_class() );
    if ( in_array( 'feature', get_post_class() ) ) {
        remove_action( 'genesis_entry_content', 'genesis_do_post_image', 8 );
    }
    if ( in_array( 'teaser', get_post_class() ) ) {
        add_action( 'genesis_entry_content', 'genesis_do_post_image', 8 );
    }
}