Work your brush back into shape to create a fine line with watercolor paint using a round brush. Mix a puddle of paint in a smooth milky consistency, fully load your brush with the paint mixture. Work the paint into the bristles, you want a fully loaded brush. Then roll the round brush through the puddle of paint and pull backwards across the palette to form the bristles back into a round point. This will help you create a more consistent fine line to do fine line work in watercolor.