I tend to be known for different things. I mean, there are a lot of comics or sci-fi fans out there who sort of think of me doing that kind of work, but there are just as many people who like the CD covers I've done, or the children's books I've done. So different people like different things.

I do very, very, very simple, skimpy doodles, nothing too committed. Because people tend to fall in love if they like it - if you color it in and they like it, then they want exactly those colors, even if they were just indications. You really have to do it as simple as possible so they can concentrate on the idea and composition. And then all of the energy goes into making the final piece. And the final piece can be anything - it can be a drawing, a painting, a collage - and usually, it's obvious what that should be. Usually, the idea dictates what medium you use.

Usually, the most difficult thing to do is photo-real stuff. Something that has to actually look like the real world, because it's just so difficult to do that. We're just so used to looking at the real world, our brains instantly see when something is not quite right.

I've always used masks. I think it's a lot about the fact that masks often reveal a sort of subconscious element to a character. The mask is carved and given an expression or markings to reveal something, even though it's shielding the face. Even though it's hiding the face, it seems to reveal something underneath.

Sometimes the things I learn making paintings or drawings - composition, colour, expressionism, texture - can directly influence the making of a film. Sometimes it's great that they are different, and simply taking a break from one medium to spend time with another, recharges the batteries and I feel refreshed.

You could easily spend several lifetimes trying to master film. It make very good use of all the things that I love. Narrative, image-making, also sound and music. It's so full that I can't really imagine getting tired of it. Or getting to the point like I feel like I know it.

But actually making pictures to look like my pictures, I've done it for so long, I'm kind of used to it now. So at the beginning of the process, designing and storyboarding everything, I sort of did all that. And then designed the characters, and doing the textures for the characters, and the texture maps to cover all the animated characters and the sets, I did those, because that's where my sort of coloring and textures get imprinted on the film.