Pixolu is a smart search engine for finding images, but don’t think it’s just another image search engine! There is one thing in it that makes it unique and worth a try when you are looking for pictures.
It provides refined image search i.e you key in one search keyword and go through the results. If you don’t find what you were looking for, then you can making another search using an image as a key. There is no end to it. Keep on drilling for the most accurate results.