Colour the entire tip of the nose and nostrils with a dark colour.
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. So decide yourself how far you want to extend the colour. 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.
If you do not want the colours to mix, be sure to wait for the first layer to dry before applying another colour over it or up against it.
By using a dark colour up against the light colour, the light part comes extra in prominence. Make sure the black line is not too thick, as that creates a sombre effect.
Hint: Regularly change the water you rinse your brushes in and preferably work with two water bowls: one for light and one for dark shades.
When working with Water Make-up preferably use separate brushes for light and dark colours. 
