Final answer:
New dinosaur discoveries in the 1990s, such as feathered and fuzzy dinosaurs, changed the way they were illustrated during that period.
Step-by-step explanation:
During the 1990s, there were many new dinosaur discoveries that changed the way scientists portrayed them in illustrations. The discoveries of dinosaurs with feathers and fuzz, as well as skin impressions and scans, provided a much fuller understanding of what dinosaurs might have looked like. Illustrations of this period began to incorporate feathered and fuzzy dinosaurs, which was a significant departure from the traditionally depicted scaly dinosaurs.