Once I have the finished drawings, I transfer to watercolor paper and begin the final illustration.
Ink is laid down with a combination of crow quill pens and brushes. Watercolor is put down in layers after that.
By this point all the hard decisions have been made and I can focus on the painting. In contrast to the preliminary drawing and much of the inking, I try to be a bit more loose with the watercolor. I try to let the paint do what it wants to do instead of controlling every aspect.