remember....it takes some time before your images start showing in Google image search results. if you site is new, you should wait for at least 6 months.
I have used PhotoBucket to store some images with relevant keyword tags. I get some traffic to some of my lenses this way. Google has picked up these images and sent me traffic. Hope this helps.
According to me using ALT tag with proper keywords for every images is the best way to index site images on google. i have done this with my site images and i have got the result on serach engine.
If you use picasa.com and send all your image it will take Google rapidly. Because picasa is Google's own site.
What setting we need to change in webmaster tool? Are there any other sites from which Google Crawls images. I also wanted to know for infographics.
Add your image to the web Post your image to a website. If you'd like your photograph or image to appear in Google search results, you'll need to post the image on a website. ... Make sure the image you post is public and searchable.