The Image Search Reports are valuable for those with visually oriented sites (ex., travel sites). If you think that people are likely to search for images for your site, you are probably right. Let's say, for example, your site is all about Arabian horses or African safaris. Lots of "photo opps" for that theme! So...
If you've included many images on your site, and if you've followed the "getting found" advice in the Image Search HQ, then you're ready to use this report.
The Image Search Report For Site ("your-domain.com") delivers "the big picture" for how many times each Search Engine (the 4 SE columns) found each page of your site through image search over the past 90 days.
This report lists only those pages that were found by an image search at either Google, Yahoo!, Live Search (formerly MSN Search) or Ask during the 90 days prior to the last update of the data. Click on the Update It! button occasionally to freshen results. (Clicking this button also updates your Search Engine HQ keyword results at the same time.)
The is the first of two levels of image search reporting...
Study this list carefully. Focus on the high volume pages first. These are on the right side of the 80-20 rule.
Note the two kinds of links on the Site Report...
1) Specific Keyword of each page
Click on the Specific Keyword to receive the corresponding Image Search for Page report. Get ready for some pleasant and useful surprises.
2) Each number ("Number of Times Found for Page")
Click on these links to go to the URLs of the corresponding image search for the Specific Keyword. You can check to see how well you rank and which images are being found. Here's a quick way to check...
Do a "keyboard FIND" (i.e., Ctrl-F, or Command-F on a Mac) right on the search results Web page for your domain name. If it's not there, advance to the next page of search results. Continue as deeply as you like.
Another use for the Site Report... Are there pages here that are being found in low numbers, but (in your judgment) you should be doing better? Review the Image Search article for tips on improving results.
Bottom line?
Google's image search amounts to about 1/8th of its "regular" text search, on average. But mileage varies. It could mean much more to your site.
If your site is not a "visual" one, ignore image search. If it is, though, image search could amount to 20% or more of your traffic. So use these two levels of Image Search Report, along with the information in Image Search HQ, to figure out how to use this strategy to generate more traffic.