I wonder why some generated images contain part of wing in the top. Could this be that we have such images in the training set? https://imgur.com/a/MeNwpWI

Yeah, they are in the training set. See https://observablehq.com/@stwind/paintings-of-butterfly-making-of . btw, for the next version I am planning to add an additional matting step to contain a single butter in single image.

ahh, ic. Also, thanks for pointing out to that notebook. I think it's also interesting.