Rule34 and Gelbooru rip.

https://gelbooru.com/index.php?page=post&s=list&tags=speh&pid=0
https://rule34.paheal.net/post/list/SefuArt

>p 121
Wtf

Base +6

As someone also in the game of trying his damndest to archive artist works from specific sites, I do appreciate you at the very least listing in your title the whereabouts of your findings.

I have a suggestion in finding dupes though that's helped me a great deal recently in some cleaning of Pixiv galleries I have.

The program CCleaner has a duplicate finder in it and you can check by content and size (and only those two). Since most times anyways, these sites are either sourcing from the same place, or each other. Very rarely do they source from some other gallery though, but it's always worth checking.

I had a recent incident where I found that only one site had an artists commission piece at a higher resolution than any other site. Though in honesty, I have no idea if it was just a higher resolution image or an upscale.

Base +5

There are also a few different free duplicate image finders around, with varying methods of comparison and margins of error for similar pics. I haven't tried any of them but I think it'd help for some uploaders.

Base +6