execute these JavaScript snippet in a google image result page, you'll get those urls in a file named urls.txt
:
// pull down jquery into the JavaScript console
var script = document.createElement('script');
script.src = "https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js";
document.getElementsByTagName('head')[0].appendChild(script);
// grab the URLs
var urls = $('.rg_di .rg_meta').map(function(){return JSON.parse($(this).text()).ou;});