First up is “Monodon Narhval" — a Narwhal — which is… colored correctly! It’s also a huge tadpole-like creature with what appears to be a lateral line, spiracle above its eyes, and one mysterious ventral fin.
Next is “Balaena roſtrata" — a Northern Bottlenose Whale. I guess the shape of the beak is roughly correct. For some reason the dorsal fin appears to be backwards and a few streaks of white have been applied at random. And what’s going on with that fully-body cellulite?
Finally is “Delphinus Orca"… apparently an Orca. The shape looks suspiciously similar to a Rondelet illustration from two centuries before, although the coloration looks a bit modern-ish. There also appears to be an anal fin and second dorsal fin.