Vector illustration/Hamster (man)

2nd character from the series "Home Lovers"
My own project on Behance (one style, one color palette, our pets).
Why is it so important to draw a series of illustrations in a single style? This indicates the quality and professionalism of the artist, who with his project proves that he is experienced and is able to create the harmony and integrity of the illustrations.
Working on creating characters for a book or a child story, it is very important to know how to concentrate the attention of a person on the content of the story.