So for Cerebus the Newsletter #15, the original cover art was penciled by Fink! and inked and toned by David B of Strawman comics. David put it up on eBay with half of the proceeds going as a donation to CerebusTV. I managed to be the winning bidder, w00t!
It arrived a couple days ago, but I just managed to get to the mailroom to get it today. It is a super nice piece! So nice that it is the only non-Dave Sim piece of Cerebus artwork to be displayed on one of my Cerebus walls: