
Note her use of browns and yellows to indicate background elements. Rather than outlining everything in black, she's outlined it in a midtone brown to allow that black cat and the steam to really pop. She's also got a grunge texture going on with the background elements that kind of makes it appear like it was all done with a silk screen process. The shaded areas are also created with a screen tone adding another layer of texture. Be sure to check out the original so you can see it in its fully textured glory.
Also check out her website.