@Mr-BoyMan_Dude Reverse searching found it easily enough for me when I needed to lookup the source with nothing to go on. Teach a man to fish and all that. Saucenao and the related links it generates should work on that one, since that's what I had to use.
Yandex in particular usually acts as a pinch hitter when nothing else seems to get results.
@Raknasuu The whole set are useful, just not necessarily every single time, probably why they set up Saucenao that way at all. The times even Yandex didn't pull it off, I have occasionally gotten something out of one of the others I don't even check unless Saucenao and Yandex don't get anything. Now, the times when not one of them manages it at all? 4chan is a surprisingly helpful last resort sometimes. They have a board or two dedicated to requests, and asking for sources is probably the most common use of them. This pretty much hinges on someone who can even recognize the thing seeing it, though.