As a painting major in art school I never quite felt like I got a handle on watercolors, working instead in oil or acrylic. Recently I was testing ideas for a handmade Valentines story and made some super simple watercolor cards and had a tiny breakthrough. Anyone could make these cards, simple painted hearts or stripes, but I finally practiced something that I remember a teacher telling me (and didn't listen to at the time). Let the watercolor do what it wants to do: pool up in some parts and remain dry brush-y (as the paint runs out off your brush) in others.