I was able to finish up a Calimbo page (although I still need to letter it!). I got started on another page, as well. This is the pre-sketch sketch. Here I'm trying to figure out how things will work in real-size. Depending on how I feel, I may do some tracing when I put this image on the actual page (sometimes I can freehand it again). I'm not sure I've figured it all out. Drawing mouths up close may not work well for me in ink. Also, I originally planned to have the mouth bigger and Montressor smaller, but I think this is about right, while still giving the illusion that Calimbo is devouring his opponent.
Finally, I took a quick look at Facebook and found this great image. So I drew it in charcoal. I think it looks okay, although it's not quite accurate to the original.