In an interview with Mashable, he explained that using digital tools for his illustrations had left him missing simple paint.
Meanwhile, his two sons, eight years old and ten years old respectively, were doodling with pencils and paper.
In an interview with Mashable, he explained that he was surprised by the creativity of his sons' drawings: "I thought they were very cool — the colour, the shapes, the ideas and looking at them inspired me."
I wanted to redraw them with my own professional skills to make them proud of their own creativity, and simply to have fun.
I thought it would be very interesting to compare the two artworks at the end, too.