Even though its fan made, ZUN didn't make it, its not a touhou baby so it makes more sense to be an original :/

There's a good amount of art of the Touhou fan characters here on Danbooru. Unfortunately, only a handful of it is currently tagged with both both the original and touhou tags, which I think makes more sense than either of them on their own. (Most are just tagged Touhou, I believe.) Perhaps some time I'll go through and edit the tags for the rest...