Hello. You did not inform the text that must be read in order for this question to be answered. This makes it impossible to provide an efficient and specific answer, but I will try to help you in the best possible way.
In the book, the monster shows yellowish skin, long black hair, large irregular teeth protruding forward and standing very tall. In the films, however, the monster is usually portrayed as a green creature, without intelligence, with a very square face and screws on the sides of the face.
The representation of the monster in the films is more childlike and portrays a popular impression about a monster created by human hands, however, the presentation of the appearance of the monster in the book, presents itself in a more consistent, less comical and more real way.