There's a lot of GAN monsters here. One of the big improvements from StyleGAN->2 was the introduction of Perceptual Path Length Loss (PPL). Has the author thought about adjusting that? Additionally there is StyleGAN2-ADA (recent) which deals better with smaller datasets (I'm not sure how big this dataset is but I'm sure it isn't as big as ImageNet). I'd imagine this would help significantly because most of the monsters are having issues with the body and multiple people, so there's probably not as many samples with that feature in the dataset. I'd be interested to see what improvements these would make.
Some Fun Monsters:
https://thisanimedoesnotexist.ai/results/psi-1.8/seed3103.pn...
https://thisanimedoesnotexist.ai/results/psi-1.8/seed4437.pn...
https://thisanimedoesnotexist.ai/results/psi-1.8/seed8810.pn...
https://thisanimedoesnotexist.ai/results/psi-1.8/seed3309.pn...
https://thisanimedoesnotexist.ai/results/psi-1.0/seed9278.pn...
https://thisanimedoesnotexist.ai/results/psi-1.8/seed8300.pn...