This is a bit old at this point, but I happened upon it while seeing if there was an api doc anywhere. That said, If an an official api is released I would certainly consider this project given my past experience writing lightroom plugins.

If you compare the file sizes it's very apparent (332KB vs 66KB), but there's a noticeable blocky compression artifacts throughout the image, most notably on right sight of the image.

Here's the FA submission https://www.furaffinity.net/view/22865420/

This is still rather troublesome... I was hoping moving my gallery back to drafts and then setting them to public in proper order would work, but submissions just re-appear in the original order. I also found when publishing all from drafts after import somehow appended the everything to the bottom of my gallery and the import before that published everything in reverse order, so my gallery is a bit of a mess atm with nothing to be done about it.