Alas, Google rolls out the image search with an image! I'm not aware though when really this feature was introduced by Google search engine, but I was pretty thrilled to see it today.
I simply click on the 'camera' icon (in the images tab) and paste an image URL or even upload an image via the 'Search by image' pop-up.
I uploaded an image of mine taken at sunset. I was impressed with the results!
