Skottie Young shares some more upcoming cover art for Cable & Deadpool over on his blog, along with the process for creating it:
You can see here the steps that I took to get to the end at the top. A quick thumbnail, about 3 inches tall. Then I do a quick photoshop comp to get an idea if I’m going to be able to take somewhere. I only spent about 10 min or so just to see I can get a feel for it. Obviously from the end, the color comp didn’t make it through all that much but it did allow me to send off and get approval. Then I blow that image up and print it out in very light blue ink. On the full size print out I start sketching the more refined version of my thumb. You can see here I was pretty lucky and was able to keep it almost exactly without having to redraw too much. I still don’t spend too much time trying to keep it clean. I don’t need, or want it clean. Then I pull out my brush and start inking. Every line is put down pretty quickly just to keep a feeling of energy in the final. Now my line art is done and it’s time to scan, and start throwing some color around. I just really go to town until I think it’s done, or the deadline tells me I’m done.