ahem. for Pixiv, try using:
and for other fanart that might be on DA or elsewhere…
That button is beautiful, press it. If your art isn’t on pixiv its usually within the top responses to lead you to your source.
There is also http://www.tineye.com/ if the other two don’t get you a source.
Also Zerochan is not a source.
WEHEARTIT IS NOT A SOURCE.