People often seem surprised when I use a sketchpad. I grew up with sketchpads. I always carry a Moleskine on me, oftentimes more than one. In my bag I generally have a Sharpie, a gel pen and a Pentel brush pen.
For Arthur I started with a Moleskine sketchbook on a train from Guildford to London. Then, on the same train, I started to block in the colours on an iPad Mini 2. On a following train I (nearly) finished colouring the image on a Surface Pro 3, finally finishing the digital painting on the same computer five minutes before the deadline of submitting it to a competition.
>>Here<< in fact.