Traits

Rat, possum, or mouse face

Cetaceans [dolphins, whales], Pinnipeds [seals, sea lions, walruses], and Sirenia [manatees]

Modern Pachyderms [Elephants, Tapirs, Hippos, Rhinos], Extinct elephant relatives [mastodons, gomphotheres, stegodon, mammoths]

Monkey, Lemur, or Ape face

Spider-like face with mouthparts replacing the muzzle [not to be confused with Insectoid Unusual Body]

[Cinnacat exclusive] Large, roman-nosed face resembling big cats

[Cinnadog exclusive] Chihuahua or Pomeranian face

[Cinnadog exclusive]  A thin elongated face resembling some domestic species

[Cinnadog exclusive] Lean, wolf-like or most domestic dog faces

Shortens the muzzle, often gives an underbite, wrinkles

Bull terrier, rounded head

Fox or Raccoon face

Horse or pony face

Kangaroo or Koala face

Face resembles any bat

Bear face 

Wolverine, weasel, or badger face

Hamster or capybara face

Face of any cloven-hoofed animal [goat, moose, deer, sheep, giraffe, bison, camel, llama, cow, etc.]

Relatively simple/mammalian Fish Face, optional fins and gills. Scales require a trait for Scaly UB.