When working with Water Make-up preferably use separate brushes for light and dark colours.
Colour the entire tip of the nose and nostrils with a dark colour. Draw a line down from the middle of the nose (between the nostrils) to the upper lip. This line gets wider as you get towards the upper lip and you then draw it along the upper lip to the corners of the mouth.
Hint: to make beautiful, thin lines, you mix the Water Make-up with Cleansing Lotion instead of water.