For me, beautiful headers always makes me excited to use my planner! In order to really see a definable style emerge as you begin playing with brush pens, you need to master this one brush lettering technique. What's great is that it is super simple!
The waterbrush tip size determines how much water is dispensed with each brush stroke. Fine brushes release less water per stroke and are good for detail work while large brushes are suited for covering larger areas.