Previous pinner said: "Moleskin art. I think I recognize this as the art of Mattias Adolfsson, but I could be totally wrong. Still, if you don't know who Mattias Adolfsson is, you should definitely look him up ^_^"
Here is a collection of 2014 sketchbook art by Jared Muralt, an artist based in Switzerland. He has his sketchbook with him at all times and fills them with studies of people, scientific inventions and the animal kingdom.