To make the eyes stand out more, you can draw black around them. 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.
When working with Water Make-up preferably use separate brushes for light and dark colours.
The more quickly you draw the line the straighter it will be, and the more pressure you apply on the brush, the thicker the line becomes.
