By optimizing your site for Google and other search engines, the images can not be everything, but should not be overlooked. According to Google, you can use Google Image Labeler, and other tools "to associate the images included in your site with labels that will improve the quality of indexing and searching them."
You can choose to image search:
First: Log in to Google Webmaster Tools with your Google Account. Click the second: Click the URL for the site you want.
3rd:Click on Tools, then click Enable enhanced image search.
Image search is less competitive than keyword search, if for no other reason, fewer sites bothered to ensure that their images are in compliance with HTML standards. There is a very good chance you'll see a jump in traffic, or at least I did.
To comply, the images should include:
• ALT attribute that describes what the image is the attribute
• title that appears when you mouse over the image
* height and width of image
• image URL residence
Help Center for Google Webmaster says alt description and title tags are the most important. Use Google Analytics to see what percent of your traffic comes from searching for pictures and keep an eye on this number over several weeks. You might be surprised at the results.