http://www.furaffinity.net/user/nitricacid
https://www.deviantart.com/nitricaciddraws
https://ninecatlifes.tumblr.com

The primary issue I have with all of these sets is that, despite listing sources where the artist will usually have given the images more descriptive filenames, they are all completely scrubbed to leave nothing more than the artist's name and a completely arbitrary sequence number, destroying any information about the image that the artist put in the file name.

Base +7, Vinatea +13, HunterHunt +7

I think the best approach would be prepending the image title with this redone filename, like {Artist}_{Index}_{OriginalName}, that way we get the best of both worlds. Images are described more clearly, and they're still easy to put in chronological order when new ones are added.

Base +6

very nicely done. Thanks.

filenames should start with a four digit number, zero padded. This will work for every single gallery since the image limit is 2,000 images.
When downloading archives, the archiver takes care of this. Just wish that the files automatically got that treatment in the image viewer mode too.

Base +24, HunterHunt +7

Unfortunately, it appears that these are just in-order scrapes from e621.net, so the numbering matches the chronological order of images on the site, and since e621 replaces the original file name with a hashed value, there's no original file name to retain. Renaming them as 'artist_seqnum' is better than a completely uninformative hash string.

Base +7, kao12345 -6