So there I was, attending Derpy Con South in New Orleans in September of 2014.
I see this super cute print of the Mane 6 as fillies. I had to inquire who the artist was, but the owner of the print was not to be found, so I asked a staffer and he told me when I would be able to catch the owner next.
After a few missed opportunities, I finally catch him at the end of the con. The only thing he could say was that he won it at the Fiesta Equestria charity auction back in 2013. So I went searching, but could find no information posted on any of that con's social media outlets.
Almost a month had past and I had about given up hope of finding the source of such cuteness. Then I found a YouTube video of the actual auction. I carefully watched the video, hoping not to skip over the auction of said print; and there it appeared, like a well of light in the darkness. I listened intently for mention of the artist's name, but none came.
But I would not be deterred so easily, my flame had been rekindled. I commented on the video, with luck, some knowledgeable soul would have the answer. Not expecting much from a video posted over a year ago, I set out to find more leads. I then happened upon an old post on Facebook outlining the charity donation submission process. A light leapt to my eyes as the post revealed an email address to send submissions to "Bronies for Good". "Surely they would have the answer written down somewhere!", I thought.
I sent off a hopeful email with a link to the video.
A few hours later I received the following response: "Thanks for the challenge. ^^ I took a screenshot, corrected the perspective, and reverse-image-searched it. Unfortunately Google is bad at indexing Tumblr (and DeviantArt too apparently), but the Yahoo search found it.