How to: Watercolour Christmas Tree card 1. Paint a brown line down your card. Then plant V shapes down the line, making them get wider as you move down the line. These are your branches. 2. With green, paint lots of tiny lines on the branches for the trees pine needles. 3. Dip your brush in water and then tap the excess off on your water jar. Use the water in your brush to go over some of the pine needles. This will make your tree look fuller. 4. With a colour of your choice, paint a bucket shap