There is no artist tag or source, so how were you able to confirm it? Who's the artist, what's his site, and where's the original picture? Don't just say that you did and not come forward with additional information about the image if you have it.
Hit the Similar button, you'll find another one. I don't know from where this bigger version came from, but there is a source on the other one. Tracking down the artist from that. 1. Source 2. Artist's Pixiv 3. Question 4. Reply edit 2: Thanks for the info glasnost.