[?] Query images using GoogleCustomSearch?

I am trying to query images using GoogleCustomSearch following the instructions on GoogleCustomSearch—Wolfram Documentation I am not able to get it to work. I can do a regular text search and it works fine but when I try to do something like:

ServiceExecute["GoogleCustomSearch", "Search", {"Query" -> "Orion spacecraft", MaxItems -> 5, 
"SearchType" -> "Image"}]

Is there something I am missing?

thanks,
Anne

I just realize there is a flag on the Google Custom Search page to enable image queries.