While it is unknown what his human form looked like before getting corrupted by ink, Sammy's ink form appears as a black, humanoid figure wearing a stained Bendy mask with a hole punched into the mouth, presumably to help Sammy breathe. He has no hair, most likely due to the ink. His head also sports a human lip and ears, however they are very difficult to see. He also wears overalls that somewhat resemble Boris'. His shoes appear to be covered by the ink-coated lower parts of his overalls.

Source: Wikia