I found the little camera icon finally on Google search, that allowed me to upload an image for a search against similarities. However it didn't display back anything even close. What am I doing wrong?
Those services are a waste of time.
If you think about it, you've got different resolution images, different sized images, different backgrounds, different foregrounds, different lighting conditions, different angles.
That would be one monster of an algorithm to make that work even at a more modest level of false positives than the high level they present currently.
I don't know much about how they work, but my guess is they are based on a fairly crude system of cryptographic hashes and that there is very little image analysis actually going on.