Watercolor has a reputation for being very demanding, it is more accurate to say that the techniques of watercolor are unique to the watercolor. Unlike oil or acrylic paint, which paints mostly stay where they are dry and more or less in the form in which they are applied, water is a complex and active partner in the process of watercolour, changing both the absorptive capacity and the shape of the paper when it is wet and the contours and the appearance of the paint as it dries. The difficulty of watercolor is almost entirely to learn to anticipate and take advantage of the behaviour of the water, rather than try to control or dominate.
the problems of watercolor painting proses because the watercolor paints is not of high hiding power, and past efforts can not simply be painted over, and the absorbent paper and is difficult, unlike an oil painting on canvas. Watercolor has a longstanding association with drawing, and sometimes we can make mistakes to make precise, make outline with pencil drawing of the object to paint, use small brushes and paint areas after dried.
Watercolor painting is traditionally, and always applied with brushes, buy you can make experiment and have combined with watercolor pencil, charcoal , pencils, chalk, ink, etching, monotype, lithography and collage, or with acrylic paint.