Journey by Aaron Becker

Journey is wordless picture book by Aaron Becker and 2014 Caldecott Honors (CH). Aaron blogs on tumblr and his posts give an insight into his process. (Medium - Water Color and ink)

The making of Journey is fascinating. It took years in making. 

There is a small interview with Aaron Becker here. Best advice he has received -

"Don't edit yourself"
Journey
By Aaron Becker