Here are some fun concept sketches/drawings for a Viking story. I hope to be doing some illustrations like these for a children's story being written by some special people to be revealed soon enough. You can see some of the elements to feature in the story here and there, but these were just as much about getting the style down.
These were all done completely within Sketchbook Pro on the Surface Book. Each one took me a few hours actually - I will probably get faster as I go along. Sketchbook Pro is quite good, it has a few quirks I am getting to terms with, but has a decent pen and touch interface I am quite liking.