Once I had the idea of the story I wanted to tell, I sketched all the pages with pencil to develop the script and to make sure that the narrative had rhythm. I also did studies of the characters, locations... These are sketches of the mutant fishes:
The next step was to draw the actual pages and I used blue mechanical pencil on A3 paper. Then, I inked the drawings by hand using thin brushes and Indian Ink. Instead of inking on the actual drawing, I made a copy of it. I wanted to keep the blue drawing clean and safe, so I inked on a very light blue print. You can see below the sketch, the blue drawing and the inked page.
I scanned the inked pages and coloured them digitally in Photoshop. You can see the colouring process in the screenshots below. I start with flat colours, then cel shading, lights, a few details and ready!