This was originally designed for a contest at threadless.com. Inspired by Raul Urias' illustration "Colera", the idea was to create a zombie influenced rendition of Homer Simpson.
The final submission for threadless.com had an average score. I recommend you to check out the other submissions at threadless as well. Some phonemenal fan work over there.
After the initial submission, I decided to expand the original artwork to a complete portrait. The goal being to create a psychadelic influenced image. And hence the final version...
Looks like Homer finally discovered how to trip.