From the Judge Dredd stories in 2000ad - Fink Angel, of the Angel Gang, and his rodent sidekick, Ratty.
The initial sketch and colour rough:
A study of Fink's ravaged face, from years of living in the irradiated Cursed Earth:
Various stages of the final image:
I left Ratty to last, because I wasn't sure how well I could paint a rat. Here are versions with and without: