The First one (Top Left) was done entirely with my galaxy note 10.1. I used a mixture of Photoshop Touch and Sketchbook Pro. It took around 2 weeks of time but that was while working 40hr/week making subs. Got it at the highest resolution that Sketchbook can handle.
The Second one (bottom) was a little more time consuming. Took about 2-3 weeks. I drew the characters and the background separately in Sketchbook Pro and exported them to Photoshop for windows. Then with Photoshop I combined them to make the one layered image.
