How to determine the efficiency of illustrator?

In order to see if the illustrator is able to perform your task effectively or not, you must check his previous work and his professional approach. If the illustrator has been working in the field for years and have offered his children’s book illustration services to more than 10 authors, it is most likely that he is capable of doing whatever you wish for. Hire that illustrator right away and explain him your entire story. What do you think about that?