I had the privilege of doing all the concept sketches for Sky Cannoneer which was just released on Steam! Check it out! All the work has been loaded onto the visdev page. It made for a great little case study in process. One of the parameters for this project was to try and provide as much as possible in a tight schedule, some light very rough zbrush was used in doing the more complicated turn-arounds. Those models were repurposed by the production artist to help with scale and placement of more complex objects. All illustrations, excepting the zbrush work, were done on my ipad.