If you are not using a Cat's Tongue brush, you definitely should. It is like the Swiss army knife of watercolor brushes! I absolutely love this style of brush and I talk about it in detail over at www.zembrush.com.
I painted this entire mermaid painting with just a Cat's Tongue brush, the no. 4 2400 Golden Taklon Cat's Tongue Brush is my current love. That triangular shape is everything! Click here to read my article over at ZEM Brush.
Also, don't forget to use code ERIKA10 to get 10% off your purchase at ZEM Brush!