95%+ images are scraped from dic.nicovideo.jp. That's AFAIK the most complete source of this artist works. Notably it included unfinished/WIP works. (but I did have to go through the boards to find them since they are missing from the artist page)
Pixiv and seiga had a few images not present on dic.nicovideo. Most notably a few Pixiv versions have a bit higher resolution.
I did verify there are no duplicates based on the pixel-data checksum and later manually but there may be a few I missed.