Have you asked these or similar questions?
What can an agent offer you as an illustrator?
How can artists attract the attention of an agent?
What should illustrators find out about an agent before working with them?
What qualities do agencies look for in an artist?
Do Fig Rolls deserve a greater recognition and fan base?if so, then head over to Digital Arts who have an article that claims to answer these and at least one other question
Two random illustrations with nothing to do with this post other than that they are illustrations