My favourite illustrator is Quentin Blake who is most famous for illustrating the Roald Dahl books. I really like his illustrations because they are part of my childhood and are really iconic around the world. I think that his illustrations are simple using a black pen and watercolour. I also like the way that he does not go by the lines of his work with the painting either going inside the drawing or going outside what makes his work so recognisable and distinct. The faces of his work is also really simple justing using two dots for the eyes and one stroke of the pen for the mouth.
http://www.quentinblake.com/en/