Hergé’s clean line technique is deceptively simple. He managed to get so much expression in the hands, face and posture with just a few well chosen lines.

The colours in this copy are uneven, showing my poor watercolour wash technique, not helped by using a water brush which continually adds water to the mix. I think the original team at the Hergé studios used gouache, which makes it easier to apply flat blocks of colour.