Picslikethat is a Fotolia powered website. If you can use it is a nice website for searching similar images. And it is different from other similar image search engines. To search a similar image you do not need to upload a picture.
To search a similar image just use one or more keyword and you will see all the results on a single page and you will see a navigation map of image results on right side corner of the result page, here you can zoom result page to see pictures in larger thumbnail. You can easily drag and drop the page. Now here is the cache how you can search similar image you have to click on a picture to search similar image, if you single click on a picture you get the option to find similar image see the preview.
You also can download these (low quality) pictures but all the pictures has a watermark but if you want to use for professional purpose you can purchase them.