Encouraged by this evidence of his ability to support himself by his art, Caldecott decided to quit his job and move to London; this he did in 1872 at the age of 26. Within two years he had become a successful magazine illustrator working on commission. His work included individual sketches, illustrations of other articles and a series of illustrations of a holiday which he and Henry Blackburn took in the Harz Mountains in Germany. The latter became the first of a number of such series.