public function images($tag = null)
    {
        $images = [];

        if (is_array($tag)) {
            foreach ($tag as $tagName) {
                $images = array_merge($images, $this->imageRepo->getImagesByTag($tag)->get()->toArray());
            }
        } elseif (is_null($tag)) {
            $images = array_merge($images, $this->imageRepo->getImagesByTag()->get()->toArray());
        } else {
            $images = array_merge($images, $this->imageRepo->getImagesByTag($tag)->get()->toArray());
        }

        return $images;
    }