It is possible to thicken china paints with castor oil
Highlights in the eyes
When working on figurines or animals be sure to include the highlights in the eyes. This is a small reflection of light in the iris, to the side of the pupil. It can be added with the tip of a sgrafitto tool, pin or lace tool for a tiny dab of white. Do not allow the white eyeball to show above the iris as this gives a fixed staring expression to the face.