private function fetchImages($photoId)
    {
        $query = array_merge(
            $this->defaultQuery,
            [
                'method'   => 'flickr.photos.getSizes',
                'photo_id' => $photoId,
            ]
        );

        $body = $this->newRequest()
            ->setQuery($query)
            ->GET()
            ->getBody('array');

        return $this->extractImagesArray($body);

    }