Grimas Water Make-Up (Pure) can be used around the eyes, but children often do not like it when brushes are so close to the eyes.
If you work above the eyes (eyelid), have your model close his/her eyes in a relaxed manner. Children are inclined to shut their eyes tight. Then you can say: keep your eyes closed as if you are sleeping.
Hint: to make beautiful, thin lines, you mix the Water Make-up with Cleansing Lotion instead of water.