The first and most obvious difference between the novel and the film is the narration.
Explanation:
While both the novel and the film address racism and prejudice, the novel addresses other issues as well, such as gender roles, and it also contains more symbolism and character development compared to the film.
If you were to recreate a painting in text form you would most likely add the thoughts and opinions of the characters depicted. This is almost impossible to present on a painting but is relatively easy in text form.