There are numerous search engines on web for searching the content on web. But all are not great for searching for what you need. Some are basic and some are advanced.
In that case you must know what are the world leading search engines that you can use for searching the content you need. This article list the most leading and advanced search engines on web for your reference.
1. GOOGLE - THE FATHER OF ALL SEARCH eNGINES
As almost all the web users know, the giant of all the search engines is Google. The algorithm of Google search engine is very complex. No one knows how exactly Google works and how it index the content in such an effective way. The search engine itself is light weighted and working very fast.
Google search engines has the capacity to search images similar to the images you have. And its ability in searching exact size images is incredible.