I searched the images with the keyword "camera". There are 3 pages of images, but very soon appear images that have nothing to do with that keyword and dont have it among their keywords. There are a lot of cats, including one of mine. My cat has keywords: animal,pet,kitten and cat, i.e. nothing remotely similar to camera...
The search engine is smart. It also looks to the photo title and to the description. your cat photo has the title "pose for camera".
Keywords are the most important though.
Title inclusion is good.
I think you can say, it works like a normal searchengine.