Here's a good resource for some lesser-known Franklin Booth works.
Flux 1.0 Dev
Same dataset as before, but trained only with a trigger phrase, `detailed pen-and-ink illustration by franklin booth`. To my surprise, it seems flexible enough.
SDXL
Made for this prematurely closed bounty.
Personally, I think the rank32 version is more well-behaved and detailed, but rank16 might have more appeal and flexibility (although maybe it's just because I spent more time testing 16 than 32). The rank16 version can be weak at times, sometimes coloring images or generating photorealistic images. Try adding words like 'monochrome' or 'lithograph' to the positive prompt and 'photo' or 'colored' to the negative prompt. I'm not sure if they are really good at landscapes (especially clouds and trees which frequently occurred in Booth works) as the results at SDXL standard image dimensions can make the line-work difficult to make out.
I also tried training a Pony V6 model too, but they were too difficult to control to release.