There's really no end to the amount of detail you can include. I don't use a computer and I don't think I ever will. I draw with a pencil initially and then I work on top of that with ink, usually a Rotring needle-point pen, but sometimes I use a fine brush which gives the line a little variety, a little texture. Then of course I add colour and atmosphere with watercolour washes.

I always put figures in. As an illustrator you quickly catch on to the fact that nobody's going to look at it if there's no human interest. When you start including figures, you can begin to create a sense of atmosphere. You can show how people relate to a space and you can explore the realities and practicalities of the place, how people lived, how they adapted to their surroundings, how they slept, how they ate.