yahoo Updates with images

Hi this is my update array. Its working fine but I want to know if its possible to add a image in the activity stream. I tried putting it in but the image doesnot show up inn yahoo pulse.. Im I doing anything wrong?

$update = array(
"collectionID" => $guid,
"collectionType" => "guid",
"class" => "app",
"source" => $source,
"type" => 'appActivity',
"suid" => $suid,
"title" => $message["action"],
"description" => $message["user_generated_content"],
"link" => $message["url"],
"pubDate" => (string)$date,
"imgURL"=> $image["src"],
"imgWidth"=> "80",
"imgHeight"=> "80",
"mediaType" => "image"
);