Julia Hill is an illustrator based in Devon, England who works primarily in pen and ink, using fine-line markers. Her main subject is animals, both domestic and small wild. She also indulges in whimsical fantasy illustrations with animals in human clothing and situations.
Some of the entries on the DoodleAddicts site include process step-throughs, and more information about her choice of pens and paper. She works with a lot of fine hatching to create tones and textures.
The DoodleAddicts website also offers a short interview with the artist, in which she also talks about her materials.