He is well known for his expressive characters and illustrations. Tulp has told many stories in magazines, books, commercials and animations for main clients like HP/De Tijd, Albert Heijn and Algemeen Dagblad. According to Tulp there is a story in a traditional portrait, a children’s book illustration, as well as in a cartoon character or background design for an animation. It is all about being as clear as possible: every element in the drawing should be supporting the story. The same goes for character design: to achieve a sense of personality, all elements should be working together to create that specific personality. Simple things form everyday life inspire Tulp in creating his characters.