This seems to be a common problem among most 'memes', AKA (( Enhanced/ruined childhood, etc. )) People tend to find that one picture they like on google images, save it, and post it on here without no recognition/source to the artist. As an artist myself, this pisses me off. Seeing other peoples great art pieces being plastered over a website that's full of advice animals and crappy memes alike.
Let me give you a quick rundown of actual sources:
-Deviantart
-Pixiv
What's not a source=
-Weheartit
-Zerochan
Now. How do you exactly want to find the source for a picture you found here? It's nothing but a simple right click, and search for the image on google. Unless the picture's been reposted so many god damn times, you'll find the source for the actual artist in the first few links.
That or you just click and drag it into the google image search.
I'll add to this in a bit.