Naveenn - 6:16 pm on Sep 5, 2012 (gmt 0)
So none of the images have been indexed till now, I'm not sure if Google takes longer than this to update the images index for a site. Most of my pages are updated in the range of 5-7 days for the google cache.
WMT tool only tests crawlability and not indexability.
I also tested the fetch tool, which loads the file, I hope the "fetch tool" also follows the robots.txt
You have not answered my question on whether you have blocked referrers other than Googlebot in your .htaccess file?
I have not blocked any referrers via .htaccess, I have only disabled "directory listing" of image folder.