This book is illustrated in oil. My underlayer is black and white acrylic on 50% gray acrylic painted watercolor panels. I make this layer as detailed as possible. Next I apply a layer of Burnt Sienna oil paint thinned with only turpentine. The final layer is full color oil. This is very similar to the technique I used for the "Jubilee!" book. These illustrations are at actual size, meaning they will be scanned at 100%.