CURL Upload Image

Hi, I am using CURL and I am receiving images in requests now I want to send data along with images to an external server via API, I am sending all data but I how will send images in API

  $file = $request->file('documents');
  				 curl_setopt_array($curl, array(
                CURLOPT_URL => '#',
                CURLOPT_RETURNTRANSFER => true,
                CURLOPT_ENCODING => '',
                CURLOPT_MAXREDIRS => 10,
                CURLOPT_TIMEOUT => 0,
                CURLOPT_FOLLOWLOCATION => true,
                CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
                CURLOPT_CUSTOMREQUEST => 'POST',
                CURLOPT_POSTFIELDS => array('DocumentType' => 'passport','DocumentFront'=> new CURLFILE('')),
                CURLOPT_HTTPHEADER => array(
                    'Authorization: Bearer '.$token
                ),
                ));