>>1611340I can tell you, or I can teach you.
1a) Open the image and copy the URL for it, then, paste that URL in the search query on
iqdb.org OR:
1b) Go to 4chan options and enable "Image Search," and click the
in the post that contains the image.
2) Find the image from among the pictures iqdb.org finds for you.
3) When you trace an image back to a booru, you can find information on it in the tags. When it comes to the source, you'll want the Character, Original show/manga/vn, and Artist tags; all of which are usually color coded on most image hosting sites.
4) Click the tag, you just found your source.
Pic related. Same artist.